diff --git a/source/blood/src/common.cpp b/source/blood/src/common.cpp
index d7ec42738..3fa72fcac 100644
--- a/source/blood/src/common.cpp
+++ b/source/blood/src/common.cpp
@@ -677,13 +677,13 @@ void G_DoAutoload(const char *dirname)
 
 #ifdef FORMAT_UPGRADE_ELIGIBLE
 
-static int32_t S_TryFormats(char * const testfn, char * const fn_suffix, char const searchfirst)
+static FileReader S_TryFormats(char * const testfn, char * const fn_suffix, char const searchfirst)
 {
 #ifdef HAVE_FLAC
     {
         Bstrcpy(fn_suffix, ".flac");
-        int32_t const fp = kopen4loadfrommod(testfn, searchfirst);
-        if (fp >= 0)
+        auto fp = kopenFileReader(testfn, searchfirst);
+        if (fp.isOpen())
             return fp;
     }
 #endif
@@ -691,16 +691,16 @@ static int32_t S_TryFormats(char * const testfn, char * const fn_suffix, char co
 #ifdef HAVE_VORBIS
     {
         Bstrcpy(fn_suffix, ".ogg");
-        int32_t const fp = kopen4loadfrommod(testfn, searchfirst);
-        if (fp >= 0)
-            return fp;
-    }
+		auto fp = kopenFileReader(testfn, searchfirst);
+		if (fp.isOpen())
+			return fp;
+	}
 #endif
 
-    return -1;
+    return FileReader();
 }
 
-static int32_t S_TryExtensionReplacements(char * const testfn, char const searchfirst, uint8_t const ismusic)
+static FileReader S_TryExtensionReplacements(char * const testfn, char const searchfirst, uint8_t const ismusic)
 {
     char * extension = Bstrrchr(testfn, '.');
     char * const fn_end = Bstrchr(testfn, '\0');
@@ -710,8 +710,8 @@ static int32_t S_TryExtensionReplacements(char * const testfn, char const search
     {
         *extension = '_';
 
-        int32_t const fp = S_TryFormats(testfn, fn_end, searchfirst);
-        if (fp >= 0)
+        auto fp = S_TryFormats(testfn, fn_end, searchfirst);
+        if (fp.isOpen())
             return fp;
     }
     else
@@ -722,28 +722,31 @@ static int32_t S_TryExtensionReplacements(char * const testfn, char const search
     // ex: grabbag.mid --> grabbag.*
     if (ismusic)
     {
-        int32_t const fp = S_TryFormats(testfn, extension, searchfirst);
-        if (fp >= 0)
-            return fp;
+        auto fp = S_TryFormats(testfn, extension, searchfirst);
+		if (fp.isOpen())
+			return fp;
     }
 
-    return -1;
+    return FileReader();
 }
 
-int32_t S_OpenAudio(const char *fn, char searchfirst, uint8_t const ismusic)
+FileReader S_OpenAudio(const char *fn, char searchfirst, uint8_t const ismusic)
 {
-    int32_t const     origfp       = kopen4loadfrommod(fn, searchfirst);
-    char const *const origparent   = origfp != -1 ? kfileparent(origfp) : NULL;
-    uint32_t const    parentlength = origparent != NULL ? Bstrlen(origparent) : 0;
+	auto origfp = kopenFileReader(fn, searchfirst);
+	char const* const origparent = origfp.isOpen() ? kfileparent(origfp) : NULL;
+	uint32_t const    parentlength = origparent != NULL ? Bstrlen(origparent) : 0;
 
     auto testfn = (char *)Xmalloc(Bstrlen(fn) + 12 + parentlength); // "music/" + overestimation of parent minus extension + ".flac" + '\0'
 
     // look in ./
     // ex: ./grabbag.mid
     Bstrcpy(testfn, fn);
-    int32_t fp = S_TryExtensionReplacements(testfn, searchfirst, ismusic);
-    if (fp >= 0)
-        goto success;
+	auto fp = S_TryExtensionReplacements(testfn, searchfirst, ismusic);
+	if (fp.isOpen())
+	{
+		Bfree(testfn);
+		return fp;
+	}
 
     // look in ./music/<file's parent GRP name>/
     // ex: ./music/duke3d/grabbag.mid
@@ -753,26 +756,29 @@ int32_t S_OpenAudio(const char *fn, char searchfirst, uint8_t const ismusic)
         char const * const parentextension = Bstrrchr(origparent, '.');
         uint32_t const namelength = parentextension != NULL ? (unsigned)(parentextension - origparent) : parentlength;
 
-        Bsprintf(testfn, "music/%.*s/%s", namelength, origparent, fn);
-        fp = S_TryExtensionReplacements(testfn, searchfirst, ismusic);
-        if (fp >= 0)
-            goto success;
+		Bsprintf(testfn, "music/%.*s/%s", namelength, origparent, fn);
+		auto fp = S_TryExtensionReplacements(testfn, searchfirst, ismusic);
+		if (fp.isOpen())
+		{
+			Bfree(testfn);
+			return fp;
+		}
     }
 
-    // look in ./music/
-    // ex: ./music/grabbag.mid
-    Bsprintf(testfn, "music/%s", fn);
-    fp = S_TryExtensionReplacements(testfn, searchfirst, ismusic);
-    if (fp >= 0)
-        goto success;
+	// look in ./music/
+	// ex: ./music/grabbag.mid
+	{
+		Bsprintf(testfn, "music/%s", fn);
+		auto fp = S_TryExtensionReplacements(testfn, searchfirst, ismusic);
+		if (fp.isOpen())
+		{
+			Bfree(testfn);
+			return fp;
+		}
+	}
 
-    fp = origfp;
-success:
-    Bfree(testfn);
-    if (fp != origfp)
-        kclose(origfp);
-
-    return fp;
+	Bfree(testfn);
+	return origfp;
 }
 
 #endif
diff --git a/source/blood/src/common_game.h b/source/blood/src/common_game.h
index 4dc5f38c5..eb130b1b4 100644
--- a/source/blood/src/common_game.h
+++ b/source/blood/src/common_game.h
@@ -541,7 +541,7 @@ static inline void G_HandleAsync(void)
 }
 
 # define FORMAT_UPGRADE_ELIGIBLE
-extern int32_t S_OpenAudio(const char *fn, char searchfirst, uint8_t ismusic);
+extern FileReader S_OpenAudio(const char *fn, char searchfirst, uint8_t ismusic);
 
 #pragma pack(push,1)
 
diff --git a/source/blood/src/sound.cpp b/source/blood/src/sound.cpp
index 8f5a0e0ac..1a9f77348 100644
--- a/source/blood/src/sound.cpp
+++ b/source/blood/src/sound.cpp
@@ -98,8 +98,8 @@ int sndPlaySong(const char *songName, bool bLoop)
     if (!songName || strlen(songName) == 0)
         return 1;
 
-    int32_t fp = S_OpenAudio(songName, 0, 1);
-    if (EDUKE32_PREDICT_FALSE(fp < 0))
+    auto fp = S_OpenAudio(songName, 0, 1);
+    if (!fp.isOpen())
     {
         hSong = gSoundRes.Lookup(songName, "MID");
         if (!hSong)
@@ -132,29 +132,25 @@ int sndPlaySong(const char *songName, bool bLoop)
         return 0;
     }
 
-    int32_t nSongLen = kfilelength(fp);
+    int32_t nSongLen = fp.Tell();
 
     if (EDUKE32_PREDICT_FALSE(nSongLen < 4))
     {
         OSD_Printf(OSD_ERROR "sndPlaySong(): error: empty music file \"%s\"\n", songName);
-        kclose(fp);
         return 3;
     }
 
     char * pNewSongPtr = (char *)Xaligned_alloc(16, nSongLen);
-    int nNewSongSize = kread(fp, pNewSongPtr, nSongLen);
+    int nNewSongSize = fp.Read(pNewSongPtr, nSongLen);
 
     if (EDUKE32_PREDICT_FALSE(nNewSongSize != nSongLen))
     {
         OSD_Printf(OSD_ERROR "sndPlaySong(): error: read %d bytes from \"%s\", expected %d\n",
             nNewSongSize, songName, nSongLen);
-        kclose(fp);
         ALIGNED_FREE_AND_NULL(pNewSongPtr);
         return 4;
     }
 
-    kclose(fp);
-
     if (!Bmemcmp(pNewSongPtr, "MThd", 4))
     {
         int32_t retval = MUSIC_PlaySong(pNewSongPtr, nNewSongSize, bLoop);
diff --git a/source/common/utility/files.h b/source/common/utility/files.h
index 488232797..525cd0a09 100644
--- a/source/common/utility/files.h
+++ b/source/common/utility/files.h
@@ -262,6 +262,13 @@ public:
 		return LittleShort(v);
 	}
 
+	int16_t ReadInt16BE()
+	{
+		uint16_t v = 0;
+		Read(&v, 2);
+		return BigShort(v);
+	}
+
 	uint32_t ReadUInt32()
 	{
 		uint32_t v = 0;
diff --git a/source/duke3d/src/common.cpp b/source/duke3d/src/common.cpp
index ebb7c394f..115af03e0 100644
--- a/source/duke3d/src/common.cpp
+++ b/source/duke3d/src/common.cpp
@@ -1059,29 +1059,30 @@ void G_LoadLookups(void)
 #ifdef FORMAT_UPGRADE_ELIGIBLE
 int g_maybeUpgradeSoundFormats = 1;
 
-static buildvfs_kfd S_TryFormats(char * const testfn, char * const fn_suffix, char const searchfirst)
+static FileReader S_TryFormats(char * const testfn, char * const fn_suffix, char const searchfirst)
 {
-    if (g_maybeUpgradeSoundFormats)
-    {
 #ifdef HAVE_FLAC
+    {
         Bstrcpy(fn_suffix, ".flac");
-        buildvfs_kfd const ffp = kopen4loadfrommod(testfn, searchfirst);
-        if (ffp != buildvfs_kfd_invalid)
-            return ffp;
+        auto fp = kopenFileReader(testfn, searchfirst);
+        if (fp.isOpen())
+            return fp;
+    }
 #endif
 
 #ifdef HAVE_VORBIS
+    {
         Bstrcpy(fn_suffix, ".ogg");
-        buildvfs_kfd const fp = kopen4loadfrommod(testfn, searchfirst);
-        if (fp != buildvfs_kfd_invalid)
-            return fp;
+		auto fp = kopenFileReader(testfn, searchfirst);
+		if (fp.isOpen())
+			return fp;
+	}
 #endif
-    }
 
-    return buildvfs_kfd_invalid;
+    return FileReader();
 }
 
-static buildvfs_kfd S_TryExtensionReplacements(char * const testfn, char const searchfirst, uint8_t const ismusic)
+static FileReader S_TryExtensionReplacements(char * const testfn, char const searchfirst, uint8_t const ismusic)
 {
     char * extension = Bstrrchr(testfn, '.');
     char * const fn_end = Bstrchr(testfn, '\0');
@@ -1091,8 +1092,8 @@ static buildvfs_kfd S_TryExtensionReplacements(char * const testfn, char const s
     {
         *extension = '_';
 
-        buildvfs_kfd const fp = S_TryFormats(testfn, fn_end, searchfirst);
-        if (fp != buildvfs_kfd_invalid)
+        auto fp = S_TryFormats(testfn, fn_end, searchfirst);
+        if (fp.isOpen())
             return fp;
     }
     else
@@ -1103,34 +1104,32 @@ static buildvfs_kfd S_TryExtensionReplacements(char * const testfn, char const s
     // ex: grabbag.mid --> grabbag.*
     if (ismusic)
     {
-        buildvfs_kfd const fp = S_TryFormats(testfn, extension, searchfirst);
-        if (fp != buildvfs_kfd_invalid)
-            return fp;
+        auto fp = S_TryFormats(testfn, extension, searchfirst);
+		if (fp.isOpen())
+			return fp;
     }
 
-    return buildvfs_kfd_invalid;
+    return FileReader();
 }
 
-buildvfs_kfd S_OpenAudio(const char *fn, char searchfirst, uint8_t const ismusic)
+FileReader S_OpenAudio(const char *fn, char searchfirst, uint8_t const ismusic)
 {
-    buildvfs_kfd const origfp      = kopen4loadfrommod(fn, searchfirst);
-#ifndef USE_PHYSFS
-    char const * const origparent  = origfp != buildvfs_kfd_invalid ? kfileparent(origfp) : NULL;
-    uint32_t const    parentlength = origparent != NULL ? Bstrlen(origparent) : 0;
+	auto origfp = kopenFileReader(fn, searchfirst);
+	char const* const origparent = origfp.isOpen() ? kfileparent(origfp) : NULL;
+	uint32_t const    parentlength = origparent != NULL ? Bstrlen(origparent) : 0;
 
     auto testfn = (char *)Xmalloc(Bstrlen(fn) + 12 + parentlength); // "music/" + overestimation of parent minus extension + ".flac" + '\0'
-#else
-    auto testfn = (char *)Xmalloc(Bstrlen(fn) + 12);
-#endif
 
     // look in ./
     // ex: ./grabbag.mid
     Bstrcpy(testfn, fn);
-    buildvfs_kfd fp = S_TryExtensionReplacements(testfn, searchfirst, ismusic);
-    if (fp != buildvfs_kfd_invalid)
-        goto success;
+	auto fp = S_TryExtensionReplacements(testfn, searchfirst, ismusic);
+	if (fp.isOpen())
+	{
+		Bfree(testfn);
+		return fp;
+	}
 
-#ifndef USE_PHYSFS
     // look in ./music/<file's parent GRP name>/
     // ex: ./music/duke3d/grabbag.mid
     // ex: ./music/nwinter/grabbag.mid
@@ -1139,27 +1138,29 @@ buildvfs_kfd S_OpenAudio(const char *fn, char searchfirst, uint8_t const ismusic
         char const * const parentextension = Bstrrchr(origparent, '.');
         uint32_t const namelength = parentextension != NULL ? (unsigned)(parentextension - origparent) : parentlength;
 
-        Bsprintf(testfn, "music/%.*s/%s", namelength, origparent, fn);
-        fp = S_TryExtensionReplacements(testfn, searchfirst, ismusic);
-        if (fp != buildvfs_kfd_invalid)
-            goto success;
+		Bsprintf(testfn, "music/%.*s/%s", namelength, origparent, fn);
+		auto fp = S_TryExtensionReplacements(testfn, searchfirst, ismusic);
+		if (fp.isOpen())
+		{
+			Bfree(testfn);
+			return fp;
+		}
     }
 
-    // look in ./music/
-    // ex: ./music/grabbag.mid
-    Bsprintf(testfn, "music/%s", fn);
-    fp = S_TryExtensionReplacements(testfn, searchfirst, ismusic);
-    if (fp != buildvfs_kfd_invalid)
-        goto success;
-#endif
+	// look in ./music/
+	// ex: ./music/grabbag.mid
+	{
+		Bsprintf(testfn, "music/%s", fn);
+		auto fp = S_TryExtensionReplacements(testfn, searchfirst, ismusic);
+		if (fp.isOpen())
+		{
+			Bfree(testfn);
+			return fp;
+		}
+	}
 
-    Xfree(testfn);
-    return origfp;
-
-success:
-    Xfree(testfn);
-    kclose(origfp);
-    return fp;
+	Bfree(testfn);
+	return origfp;
 }
 
 void Duke_CommonCleanup(void)
diff --git a/source/duke3d/src/common_game.h b/source/duke3d/src/common_game.h
index fab04137a..89483f448 100644
--- a/source/duke3d/src/common_game.h
+++ b/source/duke3d/src/common_game.h
@@ -142,7 +142,7 @@ extern void G_LoadLookups(void);
 
 # define FORMAT_UPGRADE_ELIGIBLE
 extern int g_maybeUpgradeSoundFormats;
-extern buildvfs_kfd S_OpenAudio(const char *fn, char searchfirst, uint8_t ismusic);
+extern FileReader S_OpenAudio(const char *fn, char searchfirst, uint8_t ismusic);
 
 void G_AddGroup(const char* buffer);
 void G_AddPath(const char* buffer);
diff --git a/source/duke3d/src/game.cpp b/source/duke3d/src/game.cpp
index df1bcc4ee..72c4198c5 100644
--- a/source/duke3d/src/game.cpp
+++ b/source/duke3d/src/game.cpp
@@ -6096,11 +6096,9 @@ static void G_Startup(void)
 
             Bcorrectfilename(boardfilename,0);
 
-            buildvfs_kfd ii = kopen4loadfrommod(boardfilename, 0);
-            if (ii != buildvfs_kfd_invalid)
-            {
+			if (testkopen(boardfilename, 0))
+			{
                 initprintf("Using level: \"%s\".\n",boardfilename);
-                kclose(ii);
             }
             else
             {
@@ -6461,14 +6459,11 @@ int app_main(int argc, char const * const * argv)
         g_Shareware = 1;
     else
     {
-        buildvfs_kfd const kFile = kopen4load("DUKESW.BIN",1); // JBF 20030810
-
-        if (kFile != buildvfs_kfd_invalid)
-        {
-            g_Shareware = 1;
-            kclose(kFile);
-        }
-    }
+		if (testkopen("DUKESW.BIN", 1)) // JBF 20030810
+		{
+			g_Shareware = 1;
+		}
+	}
 #endif
 
     // gotta set the proper title after we compile the CONs if this is the full version
diff --git a/source/duke3d/src/gamedef.cpp b/source/duke3d/src/gamedef.cpp
index 9d835cf61..05629f30d 100644
--- a/source/duke3d/src/gamedef.cpp
+++ b/source/duke3d/src/gamedef.cpp
@@ -1901,22 +1901,22 @@ static int C_CountCaseStatements()
 
 static void C_Include(const char *confile)
 {
-    buildvfs_kfd fp = kopen4loadfrommod(confile, g_loadFromGroupOnly);
+	auto fp = kopenFileReader(confile,g_loadFromGroupOnly);
 
-    if (EDUKE32_PREDICT_FALSE(fp == buildvfs_kfd_invalid))
+    if (!fp.isOpen())
     {
         g_errorCnt++;
         initprintf("%s:%d: error: could not find file `%s'.\n",g_scriptFileName,g_lineNumber,confile);
         return;
     }
 
-    int32_t const len = kfilelength(fp);
+    int32_t const len = fp.GetLength();
     char *mptr = (char *)Xmalloc(len+1);
 
     initprintf("Including: %s (%d bytes)\n",confile, len);
 
-    kread(fp, mptr, len);
-    kclose(fp);
+	fp.Read(mptr, len);
+	fp.Close();
 
     mptr[len] = 0;
     g_scriptcrc = Bcrc32(mptr, len, g_scriptcrc);
@@ -1956,9 +1956,8 @@ static void C_Include(const char *confile)
 #ifdef _WIN32
 static void check_filename_case(const char *fn)
 {
-    buildvfs_kfd fp;
-    if ((fp = kopen4loadfrommod(fn, g_loadFromGroupOnly)) != buildvfs_kfd_invalid)
-        kclose(fp);
+	// WTF?!?
+	testkopen(fn, g_loadFromGroupOnly);
 }
 #else
 static void check_filename_case(const char *fn) { UNREFERENCED_PARAMETER(fn); }
@@ -6261,9 +6260,9 @@ void C_Compile(const char *fileName)
     Gv_Init();
     C_InitProjectiles();
 
-    buildvfs_kfd kFile = kopen4loadfrommod(fileName, g_loadFromGroupOnly);
+    auto kFile = kopenFileReader(fileName,g_loadFromGroupOnly);
 
-    if (kFile == buildvfs_kfd_invalid) // JBF: was 0
+	if (!kFile.isOpen())
     {
         if (g_loadFromGroupOnly == 1 || numgroupfiles == 0)
         {
@@ -6286,7 +6285,7 @@ void C_Compile(const char *fileName)
         return; //Not there
     }
 
-    int const kFileLen = kfilelength(kFile);
+	int const kFileLen = kFile.GetLength();
 
     initprintf("Compiling: %s (%d bytes)\n", fileName, kFileLen);
 
@@ -6298,8 +6297,8 @@ void C_Compile(const char *fileName)
     mptr[kFileLen] = 0;
 
     textptr = (char *)mptr;
-    kread(kFile, (char *)textptr, kFileLen);
-    kclose(kFile);
+	kFile.Read((char*)textptr, kFileLen);
+	kFile.Close();
 
     g_scriptcrc = Bcrc32(NULL, 0, 0L);
     g_scriptcrc = Bcrc32(textptr, kFileLen, g_scriptcrc);
diff --git a/source/duke3d/src/gameexec.cpp b/source/duke3d/src/gameexec.cpp
index 993f1f941..8937621c0 100644
--- a/source/duke3d/src/gameexec.cpp
+++ b/source/duke3d/src/gameexec.cpp
@@ -5647,12 +5647,12 @@ badindex:
 
                     VM_ASSERT((unsigned)quoteFilename < MAXQUOTES && apStrings[quoteFilename], "invalid quote %d\n", quoteFilename);
 
-                    buildvfs_kfd kFile = kopen4loadfrommod(apStrings[quoteFilename], 0);
+                    auto kFile = kopenFileReader(apStrings[quoteFilename], 0);
 
-                    if (kFile == buildvfs_kfd_invalid)
+                    if (!kFile.isOpen())
                         dispatch();
 
-                    size_t const filelength  = kfilelength(kFile);
+					size_t const filelength = kFile.GetLength();
                     size_t const numElements = Gv_GetArrayCountForAllocSize(arrayNum, filelength);
 
                     if (numElements > 0)
@@ -5680,7 +5680,7 @@ badindex:
                             {
                                 void *const pArray = Xcalloc(1, newBytes);
 
-                                kread(kFile, pArray, readBytes);
+                                kFile.Read(pArray, readBytes);
 
                                 if (flags & GAMEARRAY_UNSIGNED)
                                 {
@@ -5699,12 +5699,12 @@ badindex:
 #endif
                             default:
                                 memset((char *)pValues + readBytes, 0, newBytes - readBytes);
-                                kread(kFile, pValues, readBytes);
+								kFile.Read(pValues, readBytes);
                                 break;
                         }
                     }
 
-                    kclose(kFile);
+					kFile.Close();
                     dispatch();
                 }
 
diff --git a/source/duke3d/src/network.cpp b/source/duke3d/src/network.cpp
index 55254ea50..e08bdf303 100644
--- a/source/duke3d/src/network.cpp
+++ b/source/duke3d/src/network.cpp
@@ -1988,16 +1988,11 @@ static void Net_ReceiveUserMapName(uint8_t *pbuf, int32_t packbufleng)
     Bcorrectfilename(boardfilename, 0);
     if (boardfilename[0] != 0)
     {
-        buildvfs_kfd i;
-        if ((i = kopen4loadfrommod(boardfilename, 0)) == buildvfs_kfd_invalid)
+        if (testkopen(boardfilename, 0))
         {
             Bmemset(boardfilename, 0, sizeof(boardfilename));
             Net_SendUserMapName();
         }
-        else
-        {
-            kclose(i);
-        }
     }
 
     if (ud.m_level_number == 7 && ud.m_volume_number == 0 && boardfilename[0] == 0)
diff --git a/source/duke3d/src/osdcmds.cpp b/source/duke3d/src/osdcmds.cpp
index de5bd1275..5b3d4f548 100644
--- a/source/duke3d/src/osdcmds.cpp
+++ b/source/duke3d/src/osdcmds.cpp
@@ -209,13 +209,11 @@ static int osdcmd_map(osdcmdptr_t parm)
 
     maybe_append_ext(filename, sizeof(filename), parm->parms[0], ".map");
 
-    buildvfs_kfd ii;
-    if ((ii = kopen4loadfrommod(filename,0)) == buildvfs_kfd_invalid)
+    if (!testkopen(filename,0))
     {
         OSD_Printf(OSD_ERROR "map: file \"%s\" not found.\n", filename);
         return OSDCMD_OK;
     }
-    kclose(ii);
 
     boardfilename[0] = '/';
     boardfilename[1] = 0;
diff --git a/source/duke3d/src/premap.cpp b/source/duke3d/src/premap.cpp
index c501bb1f6..6a855e8b8 100644
--- a/source/duke3d/src/premap.cpp
+++ b/source/duke3d/src/premap.cpp
@@ -1728,9 +1728,8 @@ void G_SetupFilenameBasedMusic(char *nameBuf, const char *fileName)
 
         Bmemcpy(p+1, ext, Bstrlen(ext) + 1);
 
-        if ((kFile = kopen4loadfrommod(nameBuf, 0)) != buildvfs_kfd_invalid)
-        {
-            kclose(kFile);
+		if (testkopen(nameBuf, 0))
+		{
             realloc_copy(&g_mapInfo[USERMAPMUSICFAKESLOT].musicfn, nameBuf);
             return;
         }
diff --git a/source/duke3d/src/savegame.cpp b/source/duke3d/src/savegame.cpp
index 7ecaee989..a62cf84dc 100644
--- a/source/duke3d/src/savegame.cpp
+++ b/source/duke3d/src/savegame.cpp
@@ -173,14 +173,12 @@ static void ReadSaveGameHeaders_CACHE1D(CACHE1D_FIND_REC *f)
             {
                 if (FURY)
                 {
-                    char extfn[BMAX_PATH];
-                    snprintf(extfn, ARRAY_SIZE(extfn), "%s.ext", fn);
-                    buildvfs_kfd extfil = kopen4loadfrommod(extfn, 0);
-                    if (extfil != buildvfs_kfd_invalid)
-                    {
-                        msv.brief.isExt = 1;
-                        kclose(extfil);
-                    }
+					FStringf extfn("%s.ext", fn);
+					auto extfil = fopenFileReader(extfn, 0);
+					if (extfil.isOpen())
+					{
+						msv.brief.isExt = 1;
+					}
                 }
             }
             msv.isOldVer = 1;
@@ -376,32 +374,22 @@ int32_t G_LoadPlayer(savebrief_t & sv)
             }
         }
 
-        char extfn[BMAX_PATH];
-        snprintf(extfn, ARRAY_SIZE(extfn), "%s.ext", sv.path);
-        buildvfs_kfd extfil = kopen4loadfrommod(extfn, 0);
-        if (extfil == buildvfs_kfd_invalid)
+		FStringf extfn("%s.ext", sv.path);
+        auto extfil = fopenFileReader(extfn, 0);
+        if (!extfil.isOpen())
         {
             return -1;
         }
 
-        int32_t len = kfilelength(extfil);
-        auto text = (char *)Xmalloc(len+1);
-        text[len] = '\0';
+		auto text = extfil.ReadPadded(1);
 
-        if (kread_and_test(extfil, text, len))
+        if (text.Size() == 0)
         {
-            kclose(extfil);
-            Xfree(text);
             return -1;
         }
 
-        kclose(extfil);
-
-
         sjson_context * ctx = sjson_create_context(0, 0, NULL);
-        sjson_node * root = sjson_decode(ctx, text);
-
-        Xfree(text);
+        sjson_node * root = sjson_decode(ctx, (const char *)text.Data());
 
         if (volume == -1)
             volume = sjson_get_int(root, "volume", volume);
diff --git a/source/duke3d/src/screens.cpp b/source/duke3d/src/screens.cpp
index 8ce467e9c..d0fc29451 100644
--- a/source/duke3d/src/screens.cpp
+++ b/source/duke3d/src/screens.cpp
@@ -1460,14 +1460,10 @@ void gameDisplay3DRScreen()
         buildvfs_kfd i;
         Net_GetPackets();
 
-        i = kopen4loadfrommod("3dr.ivf", 0);
-
-        if (i == buildvfs_kfd_invalid)
-            i = kopen4loadfrommod("3dr.anm", 0);
-
-        if (i != buildvfs_kfd_invalid)
-        {
-            kclose(i);
+		if (testkopen("3dr.ivf", 0) || testkopen("3dr.anm", 0))
+		{
+			Anim_Play("3dr.anm");
+			kclose(i);
             Anim_Play("3dr.anm");
             G_FadePalette(0, 0, 0, 252);
             I_ClearAllInput();
diff --git a/source/duke3d/src/sounds.cpp b/source/duke3d/src/sounds.cpp
index bd0b73dd8..4eda9f73b 100644
--- a/source/duke3d/src/sounds.cpp
+++ b/source/duke3d/src/sounds.cpp
@@ -212,36 +212,32 @@ static int S_PlayMusic(const char *fn)
     if (fn == NULL)
         return 1;
 
-    buildvfs_kfd fp = S_OpenAudio(fn, 0, 1);
-    if (EDUKE32_PREDICT_FALSE(fp == buildvfs_kfd_invalid))
+    auto fp = S_OpenAudio(fn, 0, 1);
+    if (!fp.isOpen())
     {
         OSD_Printf(OSD_ERROR "S_PlayMusic(): error: can't open \"%s\" for playback!\n",fn);
         return 2;
     }
 
-    int32_t MusicLen = kfilelength(fp);
+    int32_t MusicLen = fp.GetLength();
 
     if (EDUKE32_PREDICT_FALSE(MusicLen < 4))
     {
         OSD_Printf(OSD_ERROR "S_PlayMusic(): error: empty music file \"%s\"\n", fn);
-        kclose(fp);
         return 3;
     }
 
     char * MyMusicPtr = (char *)Xaligned_alloc(16, MusicLen);
-    int MyMusicSize = kread(fp, MyMusicPtr, MusicLen);
+    int MyMusicSize = fp.Read(MyMusicPtr, MusicLen);
 
     if (EDUKE32_PREDICT_FALSE(MyMusicSize != MusicLen))
     {
         OSD_Printf(OSD_ERROR "S_PlayMusic(): error: read %d bytes from \"%s\", expected %d\n",
                    MyMusicSize, fn, MusicLen);
-        kclose(fp);
         ALIGNED_FREE_AND_NULL(MyMusicPtr);
         return 4;
     }
 
-    kclose(fp);
-
     if (!Bmemcmp(MyMusicPtr, "MThd", 4))
     {
         int32_t retval = MUSIC_PlaySong(MyMusicPtr, MyMusicSize, MUSIC_LoopSong);
@@ -450,20 +446,19 @@ int32_t S_LoadSound(int num)
 
     auto &snd = g_sounds[num];
 
-    buildvfs_kfd fp = S_OpenAudio(snd.filename, g_loadFromGroupOnly, 0);
+    auto fp = S_OpenAudio(snd.filename, g_loadFromGroupOnly, 0);
 
-    if (EDUKE32_PREDICT_FALSE(fp == buildvfs_kfd_invalid))
+    if (!fp.isOpen())
     {
         OSD_Printf(OSDTEXT_RED "Sound %s(#%d) not found!\n", snd.filename, num);
         return 0;
     }
 
-    int32_t l = kfilelength(fp);
+	int32_t l = fp.GetLength();
     g_soundlocks[num] = 255;
     snd.siz = l;
     cacheAllocateBlock((intptr_t *)&snd.ptr, l, &g_soundlocks[num]);
-    l = kread(fp, snd.ptr, l);
-    kclose(fp);
+    l = fp.Read(snd.ptr, l);
 
     return l;
 }
diff --git a/source/libsmackerdec/include/FileStream.h b/source/libsmackerdec/include/FileStream.h
index 7fe408466..02ae8ee84 100644
--- a/source/libsmackerdec/include/FileStream.h
+++ b/source/libsmackerdec/include/FileStream.h
@@ -58,7 +58,7 @@ class FileStream
 		bool Is_Eos();
 
 	private:
-		int file;
+		FileReader file;
 };
 
 } // close namespace SmackerCommon
diff --git a/source/libsmackerdec/src/FileStream.cpp b/source/libsmackerdec/src/FileStream.cpp
index 414c68f4c..1cea5dbcd 100644
--- a/source/libsmackerdec/src/FileStream.cpp
+++ b/source/libsmackerdec/src/FileStream.cpp
@@ -24,8 +24,8 @@ namespace SmackerCommon {
 
 bool FileStream::Open(const std::string &fileName)
 {
-    file = kopen4loadfrommod(fileName.c_str(), 0);
-	if (file == -1)
+    file = kopenFileReader(fileName.c_str(), 0);
+	if (!file.isOpen())
 	{
 		// log error
 		return false;
@@ -36,18 +36,17 @@ bool FileStream::Open(const std::string &fileName)
 
 bool FileStream::Is_Open()
 {
-	return file != -1;
+	return file.isOpen();
 }
 
 void FileStream::Close()
 {
-    kclose(file);
-    file = -1;
+	file.Close();
 }
 
 int32_t FileStream::ReadBytes(uint8_t *data, uint32_t nBytes)
 {
-	uint32_t nCount = (uint32_t)kread(file, data, static_cast<int32_t>(nBytes));
+	uint32_t nCount = (uint32_t)file.Read(data, static_cast<int32_t>(nBytes));
 
 	if (nCount != nBytes)
 	{
@@ -59,47 +58,37 @@ int32_t FileStream::ReadBytes(uint8_t *data, uint32_t nBytes)
 
 uint32_t FileStream::ReadUint32LE()
 {
-	uint32_t value;
-	kread(file, &value, 4);
-	return B_LITTLE32(value);
+	return file.ReadInt32();
 }
 
 uint32_t FileStream::ReadUint32BE()
 {
-	uint32_t value;
-    kread(file, &value, 4);
-	return B_BIG32(value);
+	return file.ReadInt32BE();
 }
 
 uint16_t FileStream::ReadUint16LE()
 {
-	uint16_t value;
-    kread(file, &value, 2);
-	return B_LITTLE16(value);
+	return file.ReadInt16();
 }
 
 uint16_t FileStream::ReadUint16BE()
 {
-	uint16_t value;
-    kread(file, &value, 2);
-	return B_BIG16(value);
+	return file.ReadInt16BE();
 }
 
 uint8_t FileStream::ReadByte()
 {
-	uint8_t value;
-    kread(file, &value, 1);
-	return value;
+	return file.ReadInt8();
 }
 
 bool FileStream::Seek(int32_t offset, SeekDirection direction)
 {
     int32_t nStatus = -1;
 	if (kSeekStart == direction) {
-        nStatus = klseek(file, offset, SEEK_SET);
+        nStatus = file.Seek(offset, FileReader::SeekSet);
 	}
 	else if (kSeekCurrent == direction) {
-        nStatus = klseek(file, offset, SEEK_CUR);
+		nStatus = file.Seek(offset, FileReader::SeekCur);
 	}
 
 	// TODO - end seek
@@ -125,7 +114,7 @@ bool FileStream::Is_Eos()
 
 int32_t FileStream::GetPosition()
 {
-    return ktell(file);
+    return file.Tell();
 }
 
 } // close namespace SmackerCommon
diff --git a/source/rr/src/premap.cpp b/source/rr/src/premap.cpp
index d626323d9..fd75ab255 100644
--- a/source/rr/src/premap.cpp
+++ b/source/rr/src/premap.cpp
@@ -2256,6 +2256,13 @@ void G_SetupFilenameBasedMusic(char *nameBuf, const char *fileName, int levelNum
 #endif
 #ifdef HAVE_VORBIS
         "ogg",
+#endif
+#ifdef HAVE_XMP
+        "xm",
+        "mod",
+        "it",
+        "s3m",
+        "mtm",
 #endif
         "mid"
     };