FYI - maybe this will help to solve the issue. The computer this is happening on is an AMD Ryzen 5 5600X on an MSI Gaming MB with default settings. Beside KSC’s message, File Explorer on this computer is acting very strange, and I think it was happening prior to installing KSC. I set FE to display ext and hidden items. Randomly, both get unchecked. I recently added KSC Kaspersky AV. It is now randomly telling me the ext are not shown. When I look, both are still checked. Since it is an unsolved known issue, that might indicate others are having the same issue as mine. It would be interesting to know if their issue also involved an AMD CPU, an MSI MB, or both. Today I opened FE and, while both were checked, some files showed the extension and others did not in the same folder. When I went to another folder, all ext were showing. When I went back to the other folder, all ext were now showing. All the other computers are Intel based and I do not see the FE issue on them. All computers are running W10 Pro x64 and are up to date. How is KSC determining the exts are not shown?