diff --git a/CPP/appveyor.cmd b/CPP/appveyor.cmd
index 99b96fc1..773a419d 100644
--- a/CPP/appveyor.cmd
+++ b/CPP/appveyor.cmd
@@ -1,28 +1,38 @@
 @echo off
 
 REM Microsoft Windows SDK 7.1    (VC=sdk71) -> can compile for IA64, but who needs that?
-REM Microsoft Visual Studio 2010 (VC=10.0)
+REM Microsoft Visual Studio 2010 (VC=10.0) -> for win2k
 REM Microsoft Visual Studio 2012 (VC=11.0)
 REM Microsoft Visual Studio 2013 (VC=12.0)
-REM Microsoft Visual Studio 2015 (VC=14.0)  -> for: x32 + x64
-REM Microsoft Visual Studio 2017 (VC=15.0)
+REM Microsoft Visual Studio 2015 (VC=14.0)
+REM Microsoft Visual Studio 2017 (VC=15.0)  -> for: x32 + x64
 
 REM to many vcvarsall.cmd calls will blow it up!
 set OPATH=%PATH%
 set ERRFILE=%APPVEYOR_BUILD_FOLDER%\error.txt
 cd %APPVEYOR_BUILD_FOLDER%\CPP
 
-REM I am using VC 14.0 for releases now... /TR 2018-11-15
-goto vc14
+REM releases now:
+REM sdk71: ia builds
+REM vc10: win2k builds
+REM vc14: >= winxp builds
+REM /TR 2019-09-07
+goto sdk71
 
 :sdk71
 set VC=sdk71
-set NEXT=vc14
+set NEXT=vc10
 goto build_sdk
 
+:vc10
+set VC=10.0
+set NEXT=vc14
+set CFLAGS=
+goto build_xp
+
 :vc11
 set VC=11.0
-set NEXT=vc12
+set NEXT=end
 set CFLAGS=-Gw
 goto build_vc
 
@@ -39,6 +49,28 @@ set CFLAGS=-Gw
 goto build_vc
 
 
+:build_sdk
+set PATH=%OPATH%
+call "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\vcvarsall.bat" x86
+call "C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd" /Release /ia64 /xp
+set OUTDIR=%APPVEYOR_BUILD_FOLDER%\bin-%VC%-ia64
+call build-ia64.cmd
+goto %NEXT%
+
+:build_xp
+FOR /R .\ %%d IN (ARM X64 O) DO rd /S /Q %%d 2>NUL
+set SUBSYS="4.00"
+set PATH=%OPATH%
+call "C:\Program Files (x86)\Microsoft Visual Studio %VC%\VC\vcvarsall.bat" x86
+set OUTDIR=%APPVEYOR_BUILD_FOLDER%\bin-%VC%-x32-xp
+call build-x32.cmd
+set PATH=%OPATH%
+call "C:\Program Files (x86)\Microsoft Visual Studio %VC%\VC\vcvarsall.bat" x86_amd64
+set OUTDIR=%APPVEYOR_BUILD_FOLDER%\bin-%VC%-x64-xp
+call build-x64.cmd
+set SUBSYS=
+goto %NEXT%
+
 :build_vc
 FOR /R .\ %%d IN (ARM X64 O) DO rd /S /Q %%d 2>NUL
 set PATH=%OPATH%
@@ -55,14 +87,6 @@ set OUTDIR=%APPVEYOR_BUILD_FOLDER%\bin-%VC%-arm
 call build-arm.cmd
 goto %NEXT%
 
-:build_sdk
-set PATH=%OPATH%
-call "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\vcvarsall.bat" x86
-call "C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd" /Release /ia64 /xp
-set OUTDIR=%APPVEYOR_BUILD_FOLDER%\bin-%VC%-ia64
-call build-ia64.cmd
-goto %NEXT%
-
 :end
 cd %APPVEYOR_BUILD_FOLDER%
 set > env.txt
diff --git a/CPP/build-x32.cmd b/CPP/build-x32.cmd
index 22d52867..022829cd 100644
--- a/CPP/build-x32.cmd
+++ b/CPP/build-x32.cmd
@@ -3,10 +3,11 @@
 set ROOT=%cd%\7zip
 if not defined OUTDIR set OUTDIR=%ROOT%\bin32
 if not defined ERRFILE set ERRFILE=%cd%\error.txt
+if not defined SUBSYS set SUBSYS="5.01"
 mkdir %OUTDIR%
 
 set OPTS=MY_STATIC_LINK=1 /NOLOGO
-set LFLAGS=/SUBSYSTEM:WINDOWS,"5.01"
+set LFLAGS=/SUBSYSTEM:WINDOWS,%SUBSYS%
 
 cd %ROOT%\Bundles\Format7zExtract
 nmake %OPTS%
@@ -83,7 +84,7 @@ nmake %OPTS%
 IF %errorlevel% NEQ 0 echo "Error x32 @ Uninstall.exe" >> %ERRFILE%
 copy o\7zipUninstall.exe %OUTDIR%\Uninstall.exe
 
-set LFLAGS=/SUBSYSTEM:CONSOLE,"5.01"
+set LFLAGS=/SUBSYSTEM:CONSOLE,%SUBSYS%
 cd %ROOT%\UI\Console
 nmake %OPTS%
 IF %errorlevel% NEQ 0 echo "Error x32 @ 7z.exe" >> %ERRFILE%
diff --git a/CPP/build-x64.cmd b/CPP/build-x64.cmd
index 1b38a9f7..52f2c88d 100644
--- a/CPP/build-x64.cmd
+++ b/CPP/build-x64.cmd
@@ -3,10 +3,11 @@
 set ROOT=%cd%\7zip
 if not defined OUTDIR set OUTDIR=%ROOT%\bin64
 if not defined ERRFILE set ERRFILE=%cd%\error.txt
+if not defined SUBSYS set SUBSYS="5.01"
 mkdir %OUTDIR%
 
 set OPTS=PLATFORM=x64 MY_STATIC_LINK=1 /NOLOGO
-set LFLAGS=/SUBSYSTEM:WINDOWS,"5.02"
+set LFLAGS=/SUBSYSTEM:WINDOWS,%SUBSYS%
 
 cd %ROOT%\Bundles\Format7zExtract
 nmake %OPTS%
@@ -83,7 +84,7 @@ nmake %OPTS%
 IF %errorlevel% NEQ 0 echo "Error x64 @ Uninstall.exe" >> %ERRFILE%
 copy X64\7zipUninstall.exe %OUTDIR%\Uninstall.exe
 
-set LFLAGS=/SUBSYSTEM:CONSOLE,"5.02"
+set LFLAGS=/SUBSYSTEM:CONSOLE,%SUBSYS%
 cd %ROOT%\UI\Console
 nmake %OPTS%
 IF %errorlevel% NEQ 0 echo "Error x64 @ 7z.exe" >> %ERRFILE%