every try to create new excel file using right-click menu pops up even it is built-in function.
popup message is below.
"Excel cannot open the file 'New excel sheet.xlsx' because the file
format or the file extension is not valid. Verify that the
file has not been corrupted or that the file extension matches
the format of the file."
but other excel files that already created or downloaded are open normally.
only new excel files are corrupted.
i tried fixing protocols from online like these :
regedit - > ~whatever~ -> ExtensionHardening and value 0
delete office 2016 -> reboot -> install office -> reboot
changing default program
delete MS visual ++ ~~ series
Security tab (everyone)
Repairing the file trough Excel itself
Changing file extension to XLS/XLSX/XLTX (I can open under XLS, but just literally open and new excel file problem still not fixed)
every single things are not helpful. but I could fine some guys who had similar problem.
https://techcommunity.microsoft.com/t5/excel/new-excel-file-cannot-open-because-the-file-format-or-file/m-p/4016244
https://answers.microsoft.com/en-us/msoffice/forum/all/excel-cannot-open-the-file-new-microsoft-excel/0a156fae-f468-4015-8403-72c9a0ef7300
these guys still get no proper answers, so i know that i'll get nothing too but this killing me in real time. ah