B2801.7z.001 -

: If you extract the file and the resulting data is still unreadable, tools like the File Analyzer on the Microsoft Store can scan the file signature to tell you what software is required to open it.

Do you have the of this archive (like .002 or .003) in the same folder? b2801.7z.001

: If you don't have it, download the free utility from the official 7-Zip website. : If you extract the file and the