Small RAR archive of 130 KB named DLS XM40, with no brand, revision or file type stated in the name. The label may refer to a board or platform code, but that cannot be confirmed from the name alone. At this size the archive could hold a firmware dump, a boardview or a compact document. Extract it and identify the contents before use, then compare any board number inside with the markings on the PCB. If it proves to be firmware, dump the original chip first.
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 @cyberlanelectonik. 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)