How to fix corrupted xlsl download

downloaded a spreadsheet and it says it is corrupted and I can’t open it. Libre calc tries to fix it but doesn’t work either. What can I do?

Never had this problem before.

Data includes lots of personal addresses so can’t share here.


XLSL File: How to open XLSL file (and what it is)

Open xlsl file

From last link:
Files with xlsl extension are almost always Microsoft Excel spreadsheets that have been locked (encrypted) by the Document Manager software from WonderFox.

OK, how do I encrypt it? or is this possible?
Or if I download microsoft excel would that fix this?

You’d wish to decrypt, if it is already encrypted.