While "J&M123" is not a standard system file, similar naming conventions sometimes appear in specific contexts:
Knowing if it is a personal backup, a game mod, or a professional document would help identify its intended "text." J&M123.7z
Since .7z is a compressed archive format, you cannot read the text inside without first decompressing or "unzipping" the file. While "J&M123" is not a standard system file,
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 a game mod