You will need a tool like 7-Zip or The Unarchiver to open it and see the contents.

The string "ROX.\7Z" (and similar variants) appears in the raw ASCII text of SEC EDGAR filings .

: In this case, "paper" refers to the Form 6-K or Form 20-F digital "paperwork" filed by companies (like Roxgold Inc.) rather than physical stationery. Compressed Archives If you have a file named Rox.7z : It is a 7-Zip compressed file .