The .7z indicates it was created using 7-Zip or a similar compression tool. How to Open It
To access the contents, you must have (001, 002, 003, and 004) in the same folder. gsd.7z.004
The file "gsd.7z.004" is the of a split compressed archive. Key Details you must have (001
Large files are often broken into smaller "chunks" (like .001, .002, .003) for easier sharing or storage. gsd.7z.004
Ensure gsd.7z.001 through gsd.7z.004 are in one location.
Right-click on gsd.7z.001 (the first part).
You cannot open this file by itself; it is just one "piece" of the whole.