: These catalogs usually describe paper as "medium," "thick," or "wove" rather than using "Rox.7z" as a paper name itself. Technical Data and SEC Filings
In older Stanley Gibbons catalogues , "rox" and "7z" are occasionally found in text-dense lists describing stamps. : Likely a shorthand for Rose (a color). Rox.7z
You will need a tool like 7-Zip or The Unarchiver to open it and see the contents. : These catalogs usually describe paper as "medium,"
If you are looking for a specific document, could you clarify or what topic the "paper" is supposed to cover? 0001292814-16-006275.txt - SEC.gov Rox.7z
... paper as permitted by Regulation S-T Rule 101(b)(1): ... ROX.\7Z?9B"RM$ED?1OV3_AOXGT/Q?XK\::VKP&&RD_:&^*GA_P $>!O" ML%W-:
: It is typically part of a UUENCODE or Base64 data stream.