In the IDE, you can increase the number of recognized filename extensions. By default, each tool in the build toolchain accepts a set of standard filename extensions. Also, if you have source files with a different filename extension, you can modify the set of accepted filename extensions.

To get access to the necessary commands, choose Tools>Filename Extensions.

See Filename Extensions dialog box.

To override the default filename extension from the command line, include an explicit extension when you specify a filename.