ASUS P1000 material packed into a 594 KB RAR archive, with no indication in the name of whether it holds a schematic, boardview, firmware or documentation. No board number or revision is stated, so check the archive contents and compare any board marking inside with the unit on your bench. If it turns out to be a schematic, use it to trace power sequencing and signal paths. If it holds firmware, back up the existing chip with a programmer before writing anything, and make sure the image size matches the flash.
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 @IT_SERVICE_WORLD. 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.