diff --git a/src/driver/fortdrv.vcxproj b/src/driver/fortdrv.vcxproj
index 93de347c..a827c3c0 100644
--- a/src/driver/fortdrv.vcxproj
+++ b/src/driver/fortdrv.vcxproj
@@ -30,6 +30,7 @@
     <MinimumVisualStudioVersion>11.0</MinimumVisualStudioVersion>
     <Configuration Condition="'$(Configuration)'==''">Release</Configuration>
     <Platform Condition="'$(Platform)'==''">Win32</Platform>
+    <Arch Condition="'$(Arch)'==''">x86</Arch>
     <DefineConstants Condition="'$(Configuration)'=='Release'">$(DefineConstants);NDEBUG</DefineConstants>
     <DefineConstants Condition="'$(Config)'=='win7'">$(DefineConstants);FORT_WIN7_COMPAT</DefineConstants>
     <WindowsSDKDesktopARM64Support>true</WindowsSDKDesktopARM64Support>
@@ -81,7 +82,7 @@
     <FilesToPackage Include="$(TargetPath)" />
   </ItemGroup>
   <ItemGroup>
-    <MASM Include="proxycb\fortpcb_dst_x86.asm" />
+    <MASM Include="proxycb\fortpcb_dst_$(Arch).asm" />
     <ClCompile Include="fortdrv_amalg.c" />
     <ClInclude Include="fortdrv.h" />
     <ResourceCompile Include="fortdrv.rc" />
diff --git a/src/driver/loader/fortdl.vcxproj b/src/driver/loader/fortdl.vcxproj
index 7cdacb80..8bcdc6a6 100644
--- a/src/driver/loader/fortdl.vcxproj
+++ b/src/driver/loader/fortdl.vcxproj
@@ -30,6 +30,7 @@
     <MinimumVisualStudioVersion>11.0</MinimumVisualStudioVersion>
     <Configuration Condition="'$(Configuration)'==''">Release</Configuration>
     <Platform Condition="'$(Platform)'==''">Win32</Platform>
+    <Arch Condition="'$(Arch)'==''">x86</Arch>
     <DefineConstants Condition="'$(Configuration)'=='Release'">$(DefineConstants);NDEBUG</DefineConstants>
     <DefineConstants Condition="'$(Config)'=='win7'">$(DefineConstants);FORT_WIN7_COMPAT</DefineConstants>
     <WindowsSDKDesktopARM64Support>true</WindowsSDKDesktopARM64Support>
@@ -80,7 +81,7 @@
     <FilesToPackage Include="$(TargetPath)" />
   </ItemGroup>
   <ItemGroup>
-    <MASM Include="..\proxycb\fortpcb_src_x86.asm" />
+    <MASM Include="..\proxycb\fortpcb_src_$(Arch).asm" />
     <ClCompile Include="fortdl_amalg.c" />
     <ClInclude Include="fortdl.h" />
     <ResourceCompile Include="fortdl.rc" />
diff --git a/src/driver/loader/msvcbuild-win10-arm64.bat b/src/driver/loader/msvcbuild-win10-arm64.bat
index 475abb3d..0e23bcc9 100644
--- a/src/driver/loader/msvcbuild-win10-arm64.bat
+++ b/src/driver/loader/msvcbuild-win10-arm64.bat
@@ -1 +1 @@
-@%~dp0msvcbuild.bat ARM64 win10
+@%~dp0msvcbuild.bat ARM64 win10 arm64
diff --git a/src/driver/loader/msvcbuild.bat b/src/driver/loader/msvcbuild.bat
index 96df1417..53f80342 100644
--- a/src/driver/loader/msvcbuild.bat
+++ b/src/driver/loader/msvcbuild.bat
@@ -6,16 +6,20 @@
 
 @rem PLAT: x64, Win32
 @set PLAT=%1
-@if "%PLAT%"=="" PLAT=x64
+@if "%PLAT%"=="" @set PLAT=x64
 
 @rem CONFIG: win7, win10
 @set CONFIG=%2
-@if "%CONFIG%"=="" CONFIG=win10
+@if "%CONFIG%"=="" @set CONFIG=win10
+
+@rem ARCH: x86, arm64
+@set ARCH=%3
+@if "%ARCH%"=="" @set ARCH=x86
 
 @set OutDir=..\..\..\build-driver-loader-%CONFIG%\%PLAT%
 @set IntDir=%OutDir%-obj
 
-MSBuild fortdl.vcxproj /p:OutDir=%OutDir%\;IntDir=%IntDir%\;Platform=%PLAT%;Config=%CONFIG%
+MSBuild fortdl.vcxproj /p:OutDir=%OutDir%\;IntDir=%IntDir%\;Platform=%PLAT%;Config=%CONFIG%;Arch=%ARCH%
 
 @rem DumpBin /SYMBOLS "%IntDir%\fortdl.obj" > symbols.txt
 
diff --git a/src/driver/msvcbuild-win10-arm64.bat b/src/driver/msvcbuild-win10-arm64.bat
index 475abb3d..0e23bcc9 100644
--- a/src/driver/msvcbuild-win10-arm64.bat
+++ b/src/driver/msvcbuild-win10-arm64.bat
@@ -1 +1 @@
-@%~dp0msvcbuild.bat ARM64 win10
+@%~dp0msvcbuild.bat ARM64 win10 arm64
diff --git a/src/driver/msvcbuild.bat b/src/driver/msvcbuild.bat
index 348aa333..c40e05d2 100644
--- a/src/driver/msvcbuild.bat
+++ b/src/driver/msvcbuild.bat
@@ -6,16 +6,20 @@
 
 @rem PLAT: x64, Win32
 @set PLAT=%1
-@if "%PLAT%"=="" PLAT=x64
+@if "%PLAT%"=="" @set PLAT=x64
 
 @rem CONFIG: win7, win10
 @set CONFIG=%2
-@if "%CONFIG%"=="" CONFIG=win10
+@if "%CONFIG%"=="" @set CONFIG=win10
+
+@rem ARCH: x86, arm64
+@set ARCH=%3
+@if "%ARCH%"=="" @set ARCH=x86
 
 @set OutDir=..\..\build-driver-%CONFIG%\%PLAT%
 @set IntDir=%OutDir%-obj
 
-MSBuild fortdrv.vcxproj /p:OutDir=%OutDir%\;IntDir=%IntDir%\;Platform=%PLAT%;Config=%CONFIG%
+MSBuild fortdrv.vcxproj /p:OutDir=%OutDir%\;IntDir=%IntDir%\;Platform=%PLAT%;Config=%CONFIG%;Arch=%ARCH%
 
 @rem DumpBin /SYMBOLS "%IntDir%\fortdrv.obj" > symbols.txt
 
diff --git a/src/driver/proxycb/fortpcb_dst.c b/src/driver/proxycb/fortpcb_dst.c
index 5bd97659..8f2c43d4 100644
--- a/src/driver/proxycb/fortpcb_dst.c
+++ b/src/driver/proxycb/fortpcb_dst.c
@@ -2,6 +2,8 @@
 
 #include "fortpcb_dst.h"
 
+ProxyCallbackProc g_proxyCallbacksArray[PROXY_CALLBACKS_COUNT];
+
 #ifdef _WIN64
 
 #    define ProxyCallbackExtern(i) extern void proxyCallback##i(void)
diff --git a/src/driver/proxycb/fortpcb_dst_dummy.c b/src/driver/proxycb/fortpcb_dst_dummy.c
index 19bfea93..995d291a 100644
--- a/src/driver/proxycb/fortpcb_dst_dummy.c
+++ b/src/driver/proxycb/fortpcb_dst_dummy.c
@@ -2,8 +2,6 @@
 
 #include "fortpcb_dst.h"
 
-ProxyCallbackProc g_proxyCallbacksArray[PROXY_CALLBACKS_COUNT];
-
 #define ProxyCallbackFunction(i)                                                                   \
     void proxyCallback##i(void) { g_proxyCallbacksArray[i](); }
 
diff --git a/src/driver/proxycb/fortpcb_dst_x86.asm b/src/driver/proxycb/fortpcb_dst_x86.asm
index 414f252e..93a8d862 100644
--- a/src/driver/proxycb/fortpcb_dst_x86.asm
+++ b/src/driver/proxycb/fortpcb_dst_x86.asm
@@ -3,14 +3,7 @@ ELSE
 .model flat, stdcall
 ENDIF
 
-.DATA
-IFDEF RAX
-PUBLIC g_proxyCallbacksArray
-g_proxyCallbacksArray QWORD 64 DUP(?)
-ELSE
-PUBLIC g_proxyCallbacksArray
-g_proxyCallbacksArray WORD 64 DUP(?)
-ENDIF
+EXTERNDEF g_proxyCallbacksArray:BYTE
 
 .CODE
 
diff --git a/src/driver/proxycb/fortpcb_src.c b/src/driver/proxycb/fortpcb_src.c
index e5877da8..149439bf 100644
--- a/src/driver/proxycb/fortpcb_src.c
+++ b/src/driver/proxycb/fortpcb_src.c
@@ -2,6 +2,8 @@
 
 #include "fortpcb_src.h"
 
+ProxyCallbackProc g_proxyDstCallbacksArray[PROXY_CALLBACKS_COUNT];
+
 #define ProxyCallbackExtern(i) extern void WINAPI proxyDstCallback##i(void)
 
 ProxyCallbackExtern(0);
diff --git a/src/driver/proxycb/fortpcb_src_dummy.c b/src/driver/proxycb/fortpcb_src_dummy.c
index 875df6fd..9efda7b7 100644
--- a/src/driver/proxycb/fortpcb_src_dummy.c
+++ b/src/driver/proxycb/fortpcb_src_dummy.c
@@ -2,8 +2,6 @@
 
 #include "fortpcb_src.h"
 
-ProxyCallbackProc g_proxyDstCallbacksArray[PROXY_CALLBACKS_COUNT];
-
 #define ProxyCallbackFunction(i)                                                                   \
     void proxyDstCallback##i(void) { g_proxyDstCallbacksArray[i](); }
 
diff --git a/src/driver/proxycb/fortpcb_src_x86.asm b/src/driver/proxycb/fortpcb_src_x86.asm
index d7c7ddb6..42159b6b 100644
--- a/src/driver/proxycb/fortpcb_src_x86.asm
+++ b/src/driver/proxycb/fortpcb_src_x86.asm
@@ -3,14 +3,7 @@ ELSE
 .model flat, stdcall
 ENDIF
 
-.DATA
-IFDEF RAX
-PUBLIC g_proxyDstCallbacksArray
-g_proxyDstCallbacksArray QWORD 64 DUP(?)
-ELSE
-PUBLIC g_proxyDstCallbacksArray
-g_proxyDstCallbacksArray WORD 64 DUP(?)
-ENDIF
+EXTERNDEF g_proxyDstCallbacksArray:BYTE
 
 .CODE