I've found a way to get what i want.
This code used as PostBuild Function does what i need.
%wix%SDK\MakeSfxCA.exe “$(TargetDir)$(TargetName).CA$(TargetExt)” “%wix%SDK\x86\SfxCA.dll” “$(TargetPath)” “$(TargetDir)Microsoft.Deployment.WindowsInstaller.dll”
Found on buildmaestro
But due to a limitation of cmd.exe (max Chars) I could not add all files I need.
My Workarround ist to Install these Files as a hidden feature and pass the Directory via Install Property to my Custom Action.