diff --git a/bin/rsync.js b/bin/rsync.js
new file mode 100644
index 000000000..d743abe02
--- /dev/null
+++ b/bin/rsync.js
@@ -0,0 +1,19 @@
+a = new ActiveXObject("scripting.filesystemobject")
+b = WScript.Arguments(0).lastIndexOf('\\') + 1
+c = WScript.Arguments(0).substr(0, b)
+d = WScript.Arguments(0).substr(b)
+if (d.substr(0, 2) == '*.')
+{
+    d = d.substr(2)
+}
+for (b = new Enumerator(a.GetFolder(c).files); !b.atEnd(); b.moveNext())
+{
+    if ((d == '*') || (d == a.getextensionname(b.item().name)))
+    {
+        e = WScript.Arguments(1) + "\\" + b.item().Name
+        if (!a.fileexists(e) || (a.getfile(e).datelastmodified < b.item().datelastmodified))
+        {
+            new ActiveXObject("wscript.shell").run('cmd /c copy "' + c + b.item().name + '" ' + WScript.Arguments(1), 0, 1)
+        }
+    }
+}
diff --git a/src/glue.prorwts2.a b/src/glue.prorwts2.a
index 497cf8fbd..e90feefcb 100644
--- a/src/glue.prorwts2.a
+++ b/src/glue.prorwts2.a
@@ -529,27 +529,50 @@ ProDOS_enter
     beq    @jmp_zp ;always
 
 @imp_seek
-    lda    #cmdseek
-    !byte  $2c
+    jsr    @set_rdwrbuff
+    lda    #0
+    sta    blkidx
+    sta    blkofflo
+    sta    blkoffhi
+    sta    reqcmd
+    jsr    @reset
+    ldx    sizelo
+    beq    @seek64
+    sta    sizehi
+    sta    sizelo
+    jsr    @seekreset
+    inc    ldrlo
+    bne    @seek64
+    inc    ldrhi
+
+@seek64
+    lda    ldrhi
+    sta    sizehi
+    lda    ldrlo
+    sta    sizelo
+    jsr    @seekreset
+    lda    ldrhi
+    ora    ldrlo
+    bne    @jmp_zp
+    dec    blkidx
+    beq    @jmp_zp ;always
+
+@seekreset
+    jsr    hddrdwrpart
+@reset
+    lda    #$ff
+    sta    blefthi
+    sta    bleftlo
+    rts
+
 @imp_read
     lda    #cmdread
     !byte  $2c
 @imp_write
     lda    #cmdwrite
     sta    reqcmd
-    pha
     jsr    @set_rdwrbuff
-    pla
-    pha
-    bne    @set_blocks
-    lda    ldrhi
-    sta    sizehi
-    lda    ldrlo
-    sta    sizelo
-@set_blocks
     jsr    hddrdwrpart
-    pla
-    beq    @jmp_zp ;seek doesn't return size
     ldy    #6
     lda    sizelo2
     sta    (packet), y
@@ -566,7 +589,7 @@ ProDOS_enter
     iny
     lda    blefthi
     sta    (packet), y
-    jmp    @restore_zp
+    bcs    @restore_zp ;always
 
 @imp_close
     lda    @handles+1
diff --git a/winmake.bat b/winmake.bat
index fe0d997e2..2142eab45 100644
--- a/winmake.bat
+++ b/winmake.bat
@@ -24,6 +24,7 @@ if "%1" equ "asm" (
 2>nul md build\HGR
 2>nul md build\ACTION
 2>nul md build\DHGR
+2>nul md build\SHR
 2>nul md build\SS
 2>nul md build\DEMO
 2>nul md build\FX
@@ -71,6 +72,7 @@ if "%1" equ "asm" (
 %ACME% src\fx\fx.hgr.ripple.a
 %ACME% src\fx\fx.hgr.ripple2.a
 %ACME% src\fx\fx.hgr.star.a
+%ACME% src\fx\fx.shr.fizzle.a
 goto :EOF
 )
 
@@ -95,25 +97,28 @@ cscript /nologo bin/padto.js 512 build\PREFS.CONF
 %CADIUS% ADDFILE "build\%DISK%" "/%VOLUME%/" "res\ATTRACT.CONF" >>build\log
 %CADIUS% ADDFILE "build\%DISK%" "/%VOLUME%/" "res\FX.CONF" >>build\log
 %CADIUS% ADDFILE "build\%DISK%" "/%VOLUME%/" "res\DFX.CONF" >>build\log
-1>nul copy /y res\hgr\* build\HGR >>build\log
+cscript /nologo bin/rsync.js res\hgr\* build\HGR >>build\log
 cscript /nologo bin/buildfileinfo.js build\HGR "06" "4000" >>build\log
 %CADIUS% ADDFOLDER "build\%DISK%" "/%VOLUME%/HGR" "build/HGR" >>build\log
-1>nul copy /y res\action\* build\ACTION >>build\log
+cscript /nologo bin/rsync.js res\action\* build\ACTION >>build\log
 cscript /nologo bin/buildfileinfo.js build\ACTION "06" "4000" >>build\log
 %CADIUS% ADDFOLDER "build\%DISK%" "/%VOLUME%/ACTION" "build/ACTION" >>build\log
-1>nul copy /y res\dhgr\* build\DHGR >>build\log
+cscript /nologo bin/rsync.js res\dhgr\* build\DHGR >>build\log
 cscript /nologo bin/buildfileinfo.js build\DHGR "06" "4000" >>build\log
 %CADIUS% ADDFOLDER "build\%DISK%" "/%VOLUME%/DHGR" "build/DHGR" >>build\log
-1>nul copy /y res\ss\* build\SS >>build\log
+cscript /nologo bin/rsync.js res\shr\* build\SHR >>build\log
+cscript /nologo bin/buildfileinfo.js build\SHR "C1" "2000" >>build\log
+%CADIUS% ADDFOLDER "build\%DISK%" "/%VOLUME%/SHR" "build/SHR" >>build/log
+cscript /nologo bin/rsync.js res\ss\* build\SS >>build\log
 cscript /nologo bin/buildfileinfo.js build\SS "04" "4000" >>build\log
 %CADIUS% ADDFOLDER "build\%DISK%" "/%VOLUME%/SS" "build/SS" >>build\log
-1>nul copy /y res\demo\* build\DEMO >>build\log
+cscript /nologo bin/rsync.js res\demo\* build\DEMO >>build\log
 %CADIUS% ADDFOLDER "build\%DISK%" "/%VOLUME%/DEMO" "build/DEMO" >>build\log
-1>nul copy /y res\fx\* build\FX >>build\log
+cscript /nologo bin/rsync.js res\fx\* build\FX >>build\log
 %CADIUS% ADDFOLDER "build\%DISK%" "/%VOLUME%/FX" "build/FX" >>build\log
 %CADIUS% CREATEFOLDER "build\%DISK%" "/%VOLUME%/X/" >>build/log
 cscript /nologo bin/do2po.js res\dsk build\po
-1>nul copy /y res\dsk\*.po build\po
+cscript /nologo bin/rsync.js res\dsk\*.po build\po
 cscript /nologo bin/extract.js build\po >>build/log
 echo y|1>nul 2>nul del /s build\X\.DS_Store
 echo y|1>nul 2>nul del /s build\X\PRODOS