The .bgl file extension is most commonly used by the Babylon online translation program. The BGL files contain glossary files used to translate different languages. The BGL files can be generated using the Babylon Glossary Builder, allowing users to create custom glossaries for use with the software.
The .bgl file extension is also used for Microsoft Flight Simulator scenery data files.
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If you have additional information about the BGL file format or software that uses files with the BGL suffix, please do get in touch - we would love hearing from you.