Boardview for X55A board revision 2.1 in .fz format, 122 KB, matching the Asus X55A model naming though no board number appears in the name. A companion file for revision 2.2 exists, so check which revision is printed on your mainboard before relying on component positions. Viewers such as OpenBoardView and FlexBV open .fz layouts, showing part outlines, pin nets and both board sides. It helps locate test points, follow signals between chips and isolate a component shorting a power rail.
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 .fz file
Compressed and encrypted boardview used for ASUS, ASRock and Pegatron boards.