diff --git a/contrib/coapp/buildall.bat b/contrib/coapp/buildall.bat
new file mode 100644
index 0000000..e31a8e3
--- /dev/null
+++ b/contrib/coapp/buildall.bat
@@ -0,0 +1,51 @@
+@echo off
+setlocal
+
+setlocal
+call "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\vcvarsall.bat" amd64
+call :build x64 Release v120 || goto :eof
+call :build x64 Debug v120 || goto :eof
+endlocal
+
+setlocal
+call "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\vcvarsall.bat" x86
+call :build Win32 Release v120 || goto :eof
+call :build Win32 Debug v120 || goto :eof
+endlocal
+
+REM setlocal
+REM call "C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\vcvarsall.bat" amd64
+REM call :build x64 Release v110 || goto :eof
+REM call :build x64 Debug v110 || goto :eof
+REM endlocal
+
+REM setlocal
+REM call "C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\vcvarsall.bat" x86
+REM call :build Win32 Release v110 || goto :eof
+REM call :build Win32 Debug v110 || goto :eof
+REM endlocal
+
+REM setlocal
+REM call "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\vcvarsall.bat" amd64
+REM call :build x64 Release v100 || goto :eof
+REM call :build x64 Debug v100 || goto :eof
+REM endlocal
+
+REM setlocal
+REM call "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\vcvarsall.bat" x86
+REM call :build Win32 Release v100 || goto :eof
+REM call :build Win32 Debug v100 || goto :eof
+REM endlocal
+
+goto :eof
+
+:build
+msbuild /P:Platform=%1 /P:Configuration=%2 /P:PlatformToolset=%3 /P:UsesConfigurationType=Dynamic /P:CallingConvention=cdecl .\zlib.sln || goto :eof
+msbuild /P:Platform=%1 /P:Configuration=%2 /P:PlatformToolset=%3 /P:UsesConfigurationType=Dynamic /P:CallingConvention=stdcall .\zlib.sln || goto :eof
+msbuild /P:Platform=%1 /P:Configuration=%2 /P:PlatformToolset=%3 /P:UsesConfigurationType=Static /P:CallingConvention=cdecl .\zlib.sln || goto :eof
+msbuild /P:Platform=%1 /P:Configuration=%2 /P:PlatformToolset=%3 /P:UsesConfigurationType=Static /P:CallingConvention=stdcall .\zlib.sln || goto :eof
+msbuild /P:Platform=%1 /P:Configuration=%2 /P:PlatformToolset=%3 /P:UsesConfigurationType=ltcg /P:CallingConvention=cdecl .\zlib.sln || goto :eof
+msbuild /P:Platform=%1 /P:Configuration=%2 /P:PlatformToolset=%3 /P:UsesConfigurationType=ltcg /P:CallingConvention=stdcall .\zlib.sln || goto :eof
+goto :eof
+
+
diff --git a/contrib/coapp/version.inc b/contrib/coapp/version.inc
index 90144f7..c9a0a82 100644
--- a/contrib/coapp/version.inc
+++ b/contrib/coapp/version.inc
@@ -1 +1 @@
-#define { package-version : 1.2.8.6; } 
+#define { package-version : 1.2.8.7; } 
diff --git a/contrib/coapp/zlib.autopkg b/contrib/coapp/zlib.autopkg
index 4f398e9..063b545 100644
--- a/contrib/coapp/zlib.autopkg
+++ b/contrib/coapp/zlib.autopkg
@@ -64,16 +64,16 @@ nuget {
             "..\minizip\unzip.c",
             "..\minizip\zip.c",
         };
-		("v100,v110", "Win32,x64", "release,debug", "Dynamic", "cdecl,stdcall") => {
+		("v100,v110,v120", "Win32,x64", "release,debug", "Dynamic", "cdecl,stdcall", "MultiByte") => {
 			[${0},${1},${2},${3},${4}] {
-				lib:     { .\output\${0}\${1}\${2}\${3}\${4}\*.lib };
-				bin:     { .\output\${0}\${1}\${2}\${3}\${4}\*.dll };
-				symbols: { .\output\${0}\${1}\${2}\${3}\${4}\*.pdb };
+				lib:     { .\output\${0}\${1}\${2}\${3}\${4}\${5}\*.lib };
+				bin:     { .\output\${0}\${1}\${2}\${3}\${4}\${5}\*.dll };
+				symbols: { .\output\${0}\${1}\${2}\${3}\${4}\${5}\*.pdb };
 			};
 		};
-		("v100,v110", "Win32,x64", "release,debug", "Static,ltcg", "cdecl,stdcall") => {
+		("v100,v110,v120", "Win32,x64", "release,debug", "Static,ltcg", "cdecl,stdcall", "MultiByte") => {
 			[${0},${1},${2},${3},${4}] {
-				lib:     { .\output\${0}\${1}\${2}\${3}\${4}\*.lib };
+				lib:     { .\output\${0}\${1}\${2}\${3}\${4}\${5}\*.lib };
 			};
 		};