Forum Discussion
Excel cant open file because the file extension is invalid
2. Yes, i did
3. Yes, the other files can be opened normally
4. No difference from the other files in the same folder. It only uses simple formulas.
5. Yes, everything else is working normally
6. It's just this one file that is not opening
7. Excel 365
8. HP Pavilion & Windows 11
In the header to this all, you do mention the words "because the file extension is invalid"
I should have asked, (or you could have provided as well) --
- what is that invalid file extension? Is Excel giving that as a reason for not opening?
- Could you make a copy of the file and then change the extension to a valid extension (.xlsx)
- and see if that opens
- The extension is xlsx. I tried to change it to xls as per an online recommendation but it doesn’t work.
KPD22 If the extension IS xlsx it's not clear how/why/when you're getting the message that it's invalid.
I encounter regularly this "Alert" when trying to open a file that I get from a financial institution.
Are you getting a message like that? Not identical maybe, but similar?
In my case, I DO trust the data and its source, so open it without trouble.
So I'm reaching the end of my ability to offer suggestions, but there may be others here with ideas. You could help by giving a more complete description of the scenario--timing of crash, what kind of error message or alert you're getting when you try to open. Attach images if a file can't be attached.
mathetes showing this alert while opening microsoft excel. Pls suggest to restore the settings
