: The .7z.001 extension indicates this is the first segment of a multi-part compressed archive. You cannot open it unless you have all subsequent parts (002, 003, etc.) in the same folder.
If you are trying to access the contents of this specific file: 1Nf3d52g3PtR 7z 001
: Right-click the .001 file and select "Extract." The software will automatically pull data from the other parts to reconstruct the original file. 1Nf3d52g3PtR 7z 001