Macintosh HCOM files are audio files that were used by early Macintosh computers for speech synthesis. The HCOM file format is an obsolete format that is no longer used by modern Macintosh computers. HCOM files were generated using the MacinTalk speech synthesis software, which was developed by Apple and included with the Macintosh operating system. HCOM files contain digitized speech data that can be played back using a compatible audio player or application. Because the HCOM format is no longer supported by modern Macintosh computers, it can be difficult to find software that can play or convert HCOM files. However, there are some third-party audio conversion tools that may be able to convert HCOM files to more modern audio formats such as MP3 or WAV.