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Last tested: Apr 2, 2020
We have seen an issue when downloading certain formats of data in Excel. The issue crops up in an error message like this when trying to open the downloaded spreadsheet:
If you say Yes, it will tell you "Excel was able to open the file by repairing or removing the unreadable content"
You can use binary testing (aka delete each column one by one) to narrow down the particular column and row that holds the data causing the problem - in a lot of cases these are columns that hold phone numbers, which Excel doesn't seem to like.
From here, you can use SQL or REGEXP_REPLACE on the underlying data field to get it into a format Excel will accept, to fix the error.