Samsung archive covering the A750F, FN, G and GN variants, which are model codes of the Galaxy A7 2018 phone family. At 14.8 MB it most likely contains service material such as schematics, board layouts or repair guides rather than a full firmware package, so check its contents. Such documents help with locating components, tracing power and charging lines, and finding test points. Confirm that the exact variant printed on the device label matches the files before relying on them.
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 @Schematics_Mobile. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.