Thus #defines in BLI_bfile.c can be dropped, as suggested by Damien Plisson. Feel free to fill in the non Unix ones. For extra info see: http://wiki.blender.org/index.php/BlenderDev/Blender2.5/ResourceFilePaths http://wiki.blender.org/index.php/BlenderDev/Blender2.5/EnvironmentVariables