In fact，this file is in your computer in C:/Documents and Settings/All Users/Application Data/NVIDIA Corporation/NVIDIA GPU Computing SDK/C/doc/syntax_highlighting/visual_studio_8.
How to do:
Visual Studio .Net 2005 / Visual Studio 8:
1. If you don't have a usertype.dat file in your "Microsoft Visual Studio 8/Common7/IDE" folder, then copy the included usertype.dat file there. If you do, append the contents of the included usertype.dat onto the end of the "Microsoft Visual Studio 8/Common7/IDE/usertype.dat"
2. Start Visual Studio 8. Select the menu "Tools->Options...". Open "Text Editor" in the tree view on the left, and click on "File Extension". Type cu in the "Extension" box, set the editor to "Microsoft Visual C++" and click "Add". Click "OK" on the dialog box.
3. Restart Visual Studio and your CUDA code should now have syntax highlighting.