Once the text has been generated in source files, it must be compiled in order to produce a help library. By default, source files have an extension of IPF. The IPF compiler does not require this extension, but if the compiler finds two files with the same name, the file with the IPF extension is used in the compilation.
For source files that will be used to produce online documents rather than help libraries, the extension INF should be used. See Stand-Alone Online Documentation for further information.