An archive of repair files for HP hardware. Shared as “HP_Compaq_6530B_6730B_-_INVENTEC_DD08_-_REV_AX1Sec (5).rar” — a .rar file, 899 KB.
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 @generalschematics. 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)