The only files that I saw in your folder when you used Windows Explorer were CFG files which cannot be opened directly in Solid Edge (they only store ASM configuration data). With Windows Explorer, look for PAR, ASM, DFT, PSM files. Those are the Solid Edge files you can open. If they cannot be found, then that is the reason you cannot open them... Somebody deleted them.
Ken Production: ST10 MP7, Testing: SE 2019 http://Grundey.blogspot.com