: Modded or compressed game files (like those for Jet Moto or other retro titles) sometimes use "J&M" or similar shorthand in archive names.

Knowing if it is a personal backup, a game mod, or a professional document would help identify its intended "text."

: Developers often use such names for temporary ZIP or 7z backups.

You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip. 7z Format - 7-Zip 18 Documentation

: If you have the 7-Zip executable installed, you can list the filenames within the archive without extracting them by using the command: 7z l J&M123.7z . Common File Associations

If you are looking for the content of a file with this name that you currently possess, you will need to extract it using an archiving tool. How to Access the Text

Since .7z is a compressed archive format, you cannot read the text inside without first decompressing or "unzipping" the file.

: Use built-in tools or third-party apps like The Unarchiver to reveal the internal text files.