xlsm file damage

I actually had to buy Excel to recover the contents. Changed the name of the file extension from ‘.xlsm’ to ‘xlsx’ and Excel was able to open it after whacking the corrupted macros part.

I suggest that LibreOffice instate a 2 or 3 level file backup scheme to prevent irrevocable harmful changes to documents due to the ongoing MicroSoft vs. OpenSource war. That would be the KISS solution.

Please re-phrase this as a a question. I’ve downvoted this until the title is fixed. Thank you and sorry for the inconvenience.