I am using Xcode 7.3.1 and NVIDIA CUDA 8.0, and I cannot get .cu source files to automatically format as works for .c, .h, .cpp, etc in the Xcode editor. I could swear that earlier versions of Xcode (or maybe it was Bbedit?) had a place in the preferences where additional file extensions could be easily added so that they would be recognized and be indented/formatted. Does anyone know if this feature still exists? Thanks.