diff --git a/polymer/eduke32/source/lunatic/util/build.lua b/polymer/eduke32/source/lunatic/util/build.lua
index 2aed89561..64ea0becd 100644
--- a/polymer/eduke32/source/lunatic/util/build.lua
+++ b/polymer/eduke32/source/lunatic/util/build.lua
@@ -76,12 +76,8 @@ MAX =
 }
 
 local function doread(fh, basectype, numelts)
-    if (numelts==0) then
-        return nil
-    end
-
+    assert(numelts > 0)
     local cd = ffi.new(basectype.."[?]", numelts)
-    local size = ffi.sizeof(basectype)*numelts
 
     if (C.fread(cd, ffi.sizeof(basectype), numelts, fh) ~= numelts) then
         fh:close()
@@ -206,7 +202,7 @@ end
 --      }
 --    }
 function loadboard(filename, do_canonicalize_sprite)
-    local fh, errmsg = io.open(filename)
+    local fh, errmsg = io.open(filename, "rb")
 
     if (fh==nil) then
         return nil, errmsg
@@ -340,7 +336,7 @@ function loadarts(filenames)
 
     for fni=1,#filenames do
         local fn = filenames[fni]
-        local fh, errmsg = io.open(fn)
+        local fh, errmsg = io.open(fn, "rb")
 
         if (fh==nil) then
             return nil, errmsg
diff --git a/polymer/eduke32/source/lunatic/util/findmaps.sh b/polymer/eduke32/source/lunatic/util/findmaps.sh
index ad8f24f7a..74a4752bc 100755
--- a/polymer/eduke32/source/lunatic/util/findmaps.sh
+++ b/polymer/eduke32/source/lunatic/util/findmaps.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 ok=yes
 if [ -z "$1" ]; then
@@ -13,4 +13,10 @@ if [ -z "$ok" ]; then
     exit 1
 fi
 
-find -L "$1" -iname '*.map' -print0 | xargs -0 ./foreachmap.lua "-e$2"
+LOPT=-L
+idx=$(expr match `uname -s` '[mM][iI][nN][gG][wW]')
+if [ "$idx" != 0 ]; then
+    LOPT=
+fi
+
+find $LOPT "$1" -iname '*.map' -print0 | xargs -0 ./foreachmap.lua "-e$2"
diff --git a/polymer/eduke32/source/lunatic/util/foreachmap.lua b/polymer/eduke32/source/lunatic/util/foreachmap.lua
index c006b2a82..dff20ab74 100755
--- a/polymer/eduke32/source/lunatic/util/foreachmap.lua
+++ b/polymer/eduke32/source/lunatic/util/foreachmap.lua
@@ -20,6 +20,8 @@
 
 -- The local 'd' provides defs loaded from ../../names.h, example:
 --  $ ./findmaps.sh ~/.eduke32/ "sprite: .picnum>=d. CRACK1 and .picnum<=d. CRACK4"
+-- (The space between "d." and "CRACK" is because ".xxx" is translated to
+-- "sprite[<current>].xxx".)
 
 -- Print all V9 maps along with their number of bunches and max(ceilings of a bunch)
 --  $ prog='if (map.version==9) then print(map.numbunches.." ".. math.max(unpack(map.sectsperbunch[0],0)) .." "..fn) end'