Dell Inspiron/Vostro-class 3500 repair archive tied to board number 17938-1, delivered as a ZIP of about 26.9 MB. The name does not list the contents, so it may combine schematic, boardview or firmware files; check after unpacking. The 17938-1 numbering follows the Wistron pattern, the ODM that builds many Dell laptop mainboards. Match the number and revision silkscreened on the PCB before using any part of it, and if it includes a BIOS dump, back up the original SPI chip before programming.
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.