Zip package of roughly 1.2 MB covering the Nokia C2-05, listing the product codes RM-724 and RM-725. Nokia used RM type designations to identify hardware variants of the same handset, so the material inside should apply to both versions. Contents are not stated, though service schematics or layout drawings are the typical payload for files named this way. Repairers use them to follow battery, charging and keypad circuits, identify components and pick test points. Check the RM code on the label under the battery before relying on it.
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 @esquematicosparatodos. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.