Because 6MS.7z looks like a compressed archive file (the .7z file extension is used by the free and open-source file archiver 7-Zip), it most likely refers to a specific local file on your computer.
If you meant something else, please consider the following common possibilities: 6MS.7z
Could you please clarify this file belongs to, or what you are trying to accomplish? Because 6MS
on Windows.
In product catalogs, strings like 6MS/7Z are sometimes used to identify replacement parts for specific electronics (for example, switches in certain Dolce Gusto coffee machines). 6MS.7z