You can put MSBuild property files in this folder to override the default build configuration for Aegisub's build system. There is one configuration you almost guaranteed will want to override, this is for the location of wxWidgets. Here is an example of a property file that specifies a wxWidgets location: -------------- mywx.props -------------- G:\Dev\wxWidgets-2.9\install-vc10 $(WxBasePath)\lib32 $(WxBasePath)\lib64 $(WxBasePath)\include ---------------------------------------- You should not check files placed in this folder into source control. Files must be named *.props to be used.