Conversion pack for the Dell 5110, likely the Inspiron N5110, at 13.1 MB, a size that suggests it contains photos, schematic extracts and possibly a BIOS image. The name does not say which direction, though such packs usually cover moving from discrete to integrated graphics. Check that your motherboard number and revision match the guide, read through every step before removing parts, and back up the original SPI flash with a programmer before flashing any modified firmware.
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 @hrtechno. 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.