Problem with .cxx files

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I'm using visual c++ 5.0 and trying to build a project where files end with
..cxx suffix. It seems that nmake is unable to proceed, here is the error
message:

NMAKE : fatal error U1073: don't know how to make '..\MAIN\CPPMAIN.CXX'

There is a way to compile these files?

Regards.
.

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