The .g1a file extension is related to the Casio Model 9860 calculator. This calculator was developed in 2005. The file contains an add-in for the calculator. The add-in typically adds small games or utilities. A .g1a file is associated with older Casio graphing calculators. Specifically the ones used in the 2000s. Newer Casio calculators use .g2a and .g3a files. Since these files can’t manually open, you encounter them when transferring data. For example between storage and memory on the calculator. Use compatible software tools to work with .g1a files. Likely these files can’t convert to anything else. How to open: Use software compatible with .g1a files. The .g1a extension can be used by various programs. Including potentially harmful ones. Be cautious with .g1a files from unknown sources. Similar extensions are .gqa and .g1w. Check if the extension is misspelled.
Casio FA-124