: Right-click the .001 file and select "Extract" using a utility like 7-Zip or WinZip .
While the file name is generic, archives starting with "SS" or "System Shock" are frequently associated with community-made or patches, such as those found on sites like Internet Archive for titles like System Shock 2 .
Do you have the (like .001 and .002) in the same folder?
The file is the third part of a split compressed archive. The ".7z" indicates it was created with 7-Zip , and the ".003" extension confirms it is one piece of a larger file that was broken up into smaller segments for easier storage or sharing. How to use this file
: Ensure you have every numbered file in the sequence (starting from .001 ) in the same directory.