MO is an acronym for Machine Object. Files that contain the .mo file extension most commonly hold binary data files. These files store object data that is referenced by an associated software application. The MO file format is commonly used to translate application code.
The .mo file suffix is also associated with the Audacity open source software application. The Audacity software is used to record live audio, convert music tapes and records to digital file formats, edit audio files and edit sound clips. Because the Audacity software can be used in a variety of languages, it must store each language in a separate file. Each separate language file that is used by the software contains the .mo file suffix.
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