Notes about the M7A file extension:
To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened
" (Windows 7) or "How do you want to open this file?
" (Windows 10) if you double-click the file. There click on "More apps"
and choose a suitable software to view such files on your PC or from email attachments.
The M7A file type is primarily associated with 'Mapking' by Matlas Technologies, Inc. MapKing is a pan-region multilingual mobile mapping system in Asia. MapKing offers maps in English, Traditional Chinese, and Simplified Chinese. There is some discussion that would indicate you can rename Garmin G10 file to M7A for Mapking so it's possible you may be able to rename M7A to G10 for loading into a Garmin GPS device. If you can confirm this please drop FILExt a note indicating success or failure.