I can't create a new XLSX file by right-clicking and then choosing new, like this image. It always makes a corrupted, empty 0-byte file. I can still create PPTX files and Word files. I can also make new, working XLSX files using the Excel application. i tried to find ways to fix this like this: https://techcommunity.microsoft.com/discussions/excelgeneral/new-excel-file-cannot-open-because-the-file-format-or-file-extension-is-not-vali/4016244, this: https://softwarekeep.com/blogs/how-to/how-to-fix-corrupt-excel-file, this: https://www.stellarinfo.com/article/excel-cannot-open-the-file-because-t