Archive for an X99-A motherboard, with 1.01 that probably refers to the PCB revision. At 273 KB it is too small for a BIOS image and is more likely a boardview or other layout data, so check the contents after extraction. The name carries no brand. If it is a boardview, open it in OpenBoardView or FlexBV to find components, test points and signal nets, and confirm the revision printed on the board before relying on it.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @schematicslaptop. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
7-ZipWinRARThe Unarchiver (macOS)