diff --git a/src/resourcefiles/file_7z.cpp b/src/resourcefiles/file_7z.cpp
index ff2f5ec93..1b28b1fa8 100644
--- a/src/resourcefiles/file_7z.cpp
+++ b/src/resourcefiles/file_7z.cpp
@@ -319,6 +319,7 @@ bool F7ZFile::Open(bool quiet)
 
 	if (!quiet && !batchrun) Printf(", %d lumps\n", NumLumps);
 
+	GenerateHash();
 	PostProcessArchive(&Lumps[0], sizeof(F7ZLump));
 	return true;
 }
diff --git a/src/resourcefiles/file_grp.cpp b/src/resourcefiles/file_grp.cpp
index ea4de71e5..2f1ef227e 100644
--- a/src/resourcefiles/file_grp.cpp
+++ b/src/resourcefiles/file_grp.cpp
@@ -121,7 +121,7 @@ bool FGrpFile::Open(bool quiet)
 		Lumps[i].LumpNameSetup(fileinfo[i].NameWithZero);
 	}
 	if (!quiet && !batchrun) Printf(", %d lumps\n", NumLumps);
-
+	GenerateHash();
 	delete[] fileinfo;
 	return true;
 }
diff --git a/src/resourcefiles/file_pak.cpp b/src/resourcefiles/file_pak.cpp
index 29b021f18..10bb816d6 100644
--- a/src/resourcefiles/file_pak.cpp
+++ b/src/resourcefiles/file_pak.cpp
@@ -114,7 +114,7 @@ bool FPakFile::Open(bool quiet)
 		Lumps[i].LumpSize = LittleLong(fileinfo[i].filelen);
 		Lumps[i].CheckEmbedded();
 	}
-
+	GenerateHash();
 	return true;
 }
 
diff --git a/src/resourcefiles/file_rff.cpp b/src/resourcefiles/file_rff.cpp
index 6843904c0..8c1069512 100644
--- a/src/resourcefiles/file_rff.cpp
+++ b/src/resourcefiles/file_rff.cpp
@@ -185,6 +185,7 @@ bool FRFFFile::Open(bool quiet)
 		}
 	}
 	delete[] lumps;
+	GenerateHash();
 	return true;
 }
 
diff --git a/src/resourcefiles/file_wad.cpp b/src/resourcefiles/file_wad.cpp
index cdff63408..7c0afef36 100644
--- a/src/resourcefiles/file_wad.cpp
+++ b/src/resourcefiles/file_wad.cpp
@@ -206,6 +206,7 @@ bool FWadFile::Open(bool quiet)
 	}
 
 	delete[] fileinfo;
+	GenerateHash(); // Do this before the lump processing below.
 
 	if (!quiet)
 	{
diff --git a/src/resourcefiles/file_zip.cpp b/src/resourcefiles/file_zip.cpp
index 04430384e..6f57b019d 100644
--- a/src/resourcefiles/file_zip.cpp
+++ b/src/resourcefiles/file_zip.cpp
@@ -363,6 +363,7 @@ bool FZipFile::Open(bool quiet)
 
 	if (!quiet && !batchrun) Printf(TEXTCOLOR_NORMAL ", %d lumps\n", NumLumps);
 	
+	GenerateHash();
 	PostProcessArchive(&Lumps[0], sizeof(FZipLump));
 	return true;
 }
diff --git a/src/resourcefiles/resourcefile.cpp b/src/resourcefiles/resourcefile.cpp
index 02271a65b..79da7d7b0 100644
--- a/src/resourcefiles/resourcefile.cpp
+++ b/src/resourcefiles/resourcefile.cpp
@@ -42,6 +42,7 @@
 #include "gi.h"
 #include "doomstat.h"
 #include "w_zip.h"
+#include "md5.h"
 
 
 //==========================================================================
@@ -347,6 +348,39 @@ int lumpcmp(const void * a, const void * b)
 	return rec1->FullName.CompareNoCase(rec2->FullName);
 }
 
+//==========================================================================
+//
+// FResourceFile :: GenerateHash
+//
+// Generates a hash identifier for use in file identification.
+// Potential uses are mod-wide compatibility settings or localization add-ons.
+// This only hashes the lump directory but not the actual content
+//
+//==========================================================================
+
+void FResourceFile::GenerateHash()
+{
+	// hash the lump directory after sorting
+	
+	Hash.Format(("%08X-%04X-"), (unsigned)Reader.GetLength(), NumLumps);
+	
+	MD5Context md5;
+	
+	uint8_t digest[16];
+	for(uint32_t i = 0; i < NumLumps; i++)
+	{
+		auto lump = GetLump(i);
+		md5.Update((const uint8_t*)lump->Name, strlen(lump->Name) + 1); // +1 to hash the terminating 0 as well.
+		md5.Update((const uint8_t*)lump->FullName.GetChars(), lump->FullName.Len() + 1);
+		md5.Update((const uint8_t*)&lump->LumpSize, 4);
+	}
+	md5.Final(digest);
+	for (auto c : digest)
+	{
+		Hash.AppendFormat("%02X", c);
+	}
+}
+
 //==========================================================================
 //
 // FResourceFile :: PostProcessArchive
diff --git a/src/resourcefiles/resourcefile.h b/src/resourcefiles/resourcefile.h
index 9ad2e43cf..05d5e39fa 100644
--- a/src/resourcefiles/resourcefile.h
+++ b/src/resourcefiles/resourcefile.h
@@ -85,11 +85,13 @@ public:
 	FString FileName;
 protected:
 	uint32_t NumLumps;
+	FString Hash;
 
 	FResourceFile(const char *filename);
 	FResourceFile(const char *filename, FileReader &r);
 
 	// for archives that can contain directories
+	void GenerateHash();
 	void PostProcessArchive(void *lumps, size_t lumpsize);
 
 private: