I have a very long formula that is working perfectly, when I save close and reopen the file instead of the formula I see '=#VALUE!'. It's not only that the formula is not working but is disappearing. The file extension is *.xls
I discovered than changing it to *.xlsm "solve" the problem, nut I'm wondering why is this happening and how to fix it in a regular *.xls file.
Any thoughts??
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