diff --git a/src/libs/zmbv/drvproc.cpp b/src/libs/zmbv/drvproc.cpp
index 44b6ab61..299e5e67 100644
--- a/src/libs/zmbv/drvproc.cpp
+++ b/src/libs/zmbv/drvproc.cpp
@@ -68,7 +68,7 @@
  *   Defined separately for each message.
  *
  ***************************************************************************/
-LRESULT PASCAL DriverProc(DWORD dwDriverID, HDRVR hDriver, UINT uiMessage, LPARAM lParam1, LPARAM lParam2) {
+extern "C" LRESULT PASCAL __declspec(dllexport) DriverProc(DWORD dwDriverID, HDRVR hDriver, UINT uiMessage, LPARAM lParam1, LPARAM lParam2) {
   CodecInst* pi = (CodecInst*)dwDriverID;
 
   switch (uiMessage) {
diff --git a/src/libs/zmbv/makedll.mk b/src/libs/zmbv/makedll.mk
new file mode 100644
index 00000000..c2b0b024
--- /dev/null
+++ b/src/libs/zmbv/makedll.mk
@@ -0,0 +1,17 @@
+CPP=g++
+CPPFLAGS=-O3
+LIBS=-static -lz -lwinmm -static-libgcc -static-libstdc++
+
+OBJ = resource.o zmbv.o drvproc.o zmbv_vfw.o
+
+default: zmbv.dll
+
+
+resource.o: resource.rc
+	windres -i resource.rc -o resource.o
+
+%.o: %.cpp
+	$(CPP) -c -o $@ $< $(CPPFLAGS)
+
+zmbv.dll: $(OBJ) 
+	$(CPP) -shared -o $@ $^ $(CPPFLAGS) $(LIBS) zmbv_mingw.def
\ No newline at end of file
diff --git a/src/libs/zmbv/resource.h b/src/libs/zmbv/resource.h
index f4830af1..0d6f72a0 100644
--- a/src/libs/zmbv/resource.h
+++ b/src/libs/zmbv/resource.h
@@ -1,21 +1,8 @@
 //{{NO_DEPENDENCIES}}
-// Microsoft Visual C++ generated include file.
-// Used by zmbv_vfw.rc
-//
+
 #define IDD_ABOUT                       101
 #define IDD_CONFIGURE                   102
 #define IDC_HOMEPAGE                    1000
 #define IDC_EMAIL                       1001
 #define IDC_SLIDER1                     1008
 
-// Next default values for new objects
-// 
-#ifdef APSTUDIO_INVOKED
-#ifndef APSTUDIO_READONLY_SYMBOLS
-#define _APS_NO_MFC                     1
-#define _APS_NEXT_RESOURCE_VALUE        103
-#define _APS_NEXT_COMMAND_VALUE         40001
-#define _APS_NEXT_CONTROL_VALUE         1009
-#define _APS_NEXT_SYMED_VALUE           101
-#endif
-#endif
diff --git a/src/libs/zmbv/resource.rc b/src/libs/zmbv/resource.rc
new file mode 100644
index 00000000..5e4e3a48
--- /dev/null
+++ b/src/libs/zmbv/resource.rc
@@ -0,0 +1,40 @@
+#include "resource.h"
+#include "windows.h"
+
+#ifndef IDC_STATIC
+#define IDC_STATIC              -1
+#endif
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// Dialog
+//
+
+IDD_ABOUT DIALOGEX 0, 0, 167, 55
+STYLE DS_SETFONT | DS_MODALFRAME | DS_CENTER | WS_POPUP | WS_CAPTION |
+    WS_SYSMENU
+CAPTION "DOSBox Video Codec v0.1a"
+FONT 8, "MS Sans Serif", 0, 0, 0x0
+BEGIN
+    DEFPUSHBUTTON   "OK",IDOK,131,34,29,14
+    CTEXT           "Zipped Motion Block Video v 0.1\nCopyright 2009-2019 DOSBox Team",
+                    IDC_STATIC,7,7,153,25,SS_NOPREFIX
+    PUSHBUTTON      "Email author",IDC_EMAIL,7,34,50,14
+    PUSHBUTTON      "Visit home page",IDC_HOMEPAGE,59,34,58,14
+END
+
+IDD_CONFIGURE DIALOGEX 0, 0, 213, 146
+STYLE DS_SETFONT | DS_MODALFRAME | DS_CENTER | WS_POPUP | WS_CAPTION |
+    WS_SYSMENU
+CAPTION "ZMBV configuration dialog"
+FONT 8, "MS Sans Serif", 0, 0, 0x0
+BEGIN
+    PUSHBUTTON      "Email author",IDC_EMAIL,44,86,50,14
+    PUSHBUTTON      "Visit home page",IDC_HOMEPAGE,109,87,58,14
+    DEFPUSHBUTTON   "OK",IDOK,44,125,50,14
+    PUSHBUTTON      "Cancel",IDCANCEL,117,125,50,14
+    CONTROL         "",IDC_SLIDER1,"msctls_trackbar32",TBS_BOTH |
+                    TBS_NOTICKS | WS_TABSTOP,57,30,92,18
+END
+
+
diff --git a/src/libs/zmbv/zmbv_mingw.def b/src/libs/zmbv/zmbv_mingw.def
new file mode 100644
index 00000000..04142744
--- /dev/null
+++ b/src/libs/zmbv/zmbv_mingw.def
@@ -0,0 +1,2 @@
+EXPORTS
+    DriverProc = DriverProc@20 @1
diff --git a/src/libs/zmbv/zmbv_vfw.cpp b/src/libs/zmbv/zmbv_vfw.cpp
index dec8dc6f..3be8459e 100644
--- a/src/libs/zmbv/zmbv_vfw.cpp
+++ b/src/libs/zmbv/zmbv_vfw.cpp
@@ -30,10 +30,10 @@
 #include <crtdbg.h>
 #include <string.h>
 
-TCHAR szDescription[] = TEXT("Zipped Motion Block Video v0.1");
+TCHAR szDescription[] = TEXT("Zipped Motion Block Video v0.1a");
 TCHAR szName[]        = TEXT(CODEC_4CC);
 
-#define VERSION         0x00000001      // 0.1
+#define VERSION         0x00000002      // newer version
 
 /********************************************************************
 ********************************************************************/
@@ -90,7 +90,7 @@ DWORD Close(CodecInst* pinst) {
 
 BOOL CodecInst::QueryAbout() { return TRUE; }
 
-static BOOL CALLBACK AboutDialogProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam) {
+static INT_PTR CALLBACK AboutDialogProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam) {
   if (uMsg == WM_COMMAND) {
     switch (LOWORD(wParam)) {
     case IDOK:
@@ -111,7 +111,7 @@ DWORD CodecInst::About(HWND hwnd) {
   return ICERR_OK;
 }
 
-static BOOL CALLBACK ConfigureDialogProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam) {
+static INT_PTR CALLBACK ConfigureDialogProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam) {
 
   if (uMsg == WM_INITDIALOG) {
 
@@ -175,6 +175,7 @@ DWORD CodecInst::GetInfo(ICINFO* icinfo, DWORD dwSize) {
 ****************************************************************/
 
 static int GetInputBitDepth(const BITMAPINFOHEADER *lpbiIn) {
+	//Msg( "Get input depth compression %d bitcount %d\n", lpbiIn->biCompression, lpbiIn->biBitCount );
 	if (lpbiIn->biCompression == BI_RGB) {
 		if (lpbiIn->biPlanes != 1)
 			return -1;
@@ -214,11 +215,14 @@ static bool CanCompress(LPBITMAPINFOHEADER lpbiIn, LPBITMAPINFOHEADER lpbiOut, b
 	if (lpbiIn) {
 		if (GetInputBitDepth(lpbiIn) < 0)
 			return false;
-	} else return false;
+	} else 
+		return false;
 	if (lpbiOut) {
+		//Needs to match our 4cc format
 		if (memcmp(&lpbiOut->biCompression,CODEC_4CC, 4))
 			return false;
-	} else return !requireOutput;
+	} else
+		return !requireOutput;
 	return true;
 }
 
@@ -226,7 +230,8 @@ static bool CanCompress(LPBITMAPINFOHEADER lpbiIn, LPBITMAPINFOHEADER lpbiOut, b
 ****************************************************************/
 
 DWORD CodecInst::CompressQuery(LPBITMAPINFOHEADER lpbiIn, LPBITMAPINFOHEADER lpbiOut) {
-	if (CanCompress(lpbiIn,lpbiOut,false)) return ICERR_OK;
+	if (CanCompress(lpbiIn,lpbiOut,false)) 
+		return ICERR_OK;
 	return ICERR_BADFORMAT;
 }
 
@@ -373,7 +378,8 @@ DWORD CodecInst::DecompressQuery(LPBITMAPINFOHEADER lpbiIn, LPBITMAPINFOHEADER l
 DWORD CodecInst::DecompressGetFormat(LPBITMAPINFOHEADER lpbiIn, LPBITMAPINFOHEADER lpbiOut) {
 	if (memcmp(&lpbiIn->biCompression,CODEC_4CC,4))
 		 return ICERR_BADFORMAT;
-	if (!lpbiOut) return sizeof(BITMAPINFOHEADER);
+	if (!lpbiOut)
+		return sizeof(BITMAPINFOHEADER);
 	*lpbiOut = *lpbiIn;
 	lpbiOut->biPlanes		= 1;
 	lpbiOut->biSize			= sizeof(BITMAPINFOHEADER);