ZIP archive of about 80 MB for the HP EliteBook 745 G2 mainboard, board number 6050A2644501, marked MB revision A02. The 6050Axxxxxxx numbering is Inventec's, the ODM behind many HP business notebooks. The name does not list the contents, but a package of this size typically holds a schematic, boardview or firmware for the board, so inspect it after extracting. Compare the number and revision printed on the PCB with the file before using it to trace rails, locate parts or reflash a chip.
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 @azvoltagemap. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.