Files ending in .7z.001 , .7z.002 , and .7z.003 are "split" volumes of a single large 7-Zip file. You cannot open part .003 on its own.
Are you having trouble with a during extraction or while trying to import the files into a program? SS-Oli-003_v.7z.003
(usually 2022.3.x for VRChat).