We can use the tool Visual Assist X to implement it: First, find the Visual Assist X install directory: Program FilesVisual Assist XAutotext, then make a copy of Cpp.tpl, rename it to Cu.tpl, apply same operation to the “Latest” directory. Second, open the regedit table, and search it with the key word “Visual Assist X” until you find in the VANet8 in HKEY_USERSS-1-5-21-1757981266-220523388-725345543-1003SoftwareWhole TomatoVisual Assist XVANet8 Here you can see many attribute setting about Visual Assist X, click the item ExtHeader and add the .cu in the list, same to the item ExtSource. save and quit.