ZIP archive of 117 KB for the ASUS X402CA laptop main board, revision 2.1. The contents are not named, but the size suggests a boardview layout rather than a full schematic. Open it in a boardview viewer such as OpenBoardView or FlexBV to see part placement and net connections on both sides of the PCB. Make sure the revision printed on your board is 2.1 before trusting component positions. It helps with locating parts, following signals to test points and tracking down shorts on power rails.
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 @ITHINKHS. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.