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
Right-click on gsd.7z.001 (the first part). you must have (001
The file "gsd.7z.004" is the of a split compressed archive. Key Details gsd.7z.004