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Command-Line Error D8045 

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Error Message

cannot compile C file 'file' with the /clr option

Only C++ source code files can be passed to a compilation that uses /clr. Use /TP to compile a .c file as a .cpp file; see /Tc, /Tp, /TC, /TP (Specify Source File Type) for more information.

For more information, see /clr (Common Language Runtime Compilation).

D8045 can also occur if you compile an ATL application using Visual C++ 2005. See How To: Migrate to /clr for more information.