The .ph file extension is most commonly associated with Perl header files. The PH files contain header files that can be referenced by various Perl script files. The PH files contain code that has been written in the Perl language. These files are similar to C header files that contain the .h file extension, but are used by Perl programs.
The .ph file extension is also used for Geoworks optimized include files, Microsoft Windows Help file phrase-table files, AOL Phone Home data files, MRS-802 phrase audio data files and Profan header files.
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