.xlsx is a proprietary file format for M$’s spreadsheet program. The easiest 
way I’ve found to deal with them is to convert them to .ods (open document 
spreadsheet format) through the online tool available at I believe they will convert five files at a time for 

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> On Jan 27, 2024, at 2:38 PM, SUSEN KAY <> wrote:
> I need to open some xlsx files and I can't figure out what file format to 
> use.
> I go to "spreadsheet" and then click on my file xlsx to open, but I am then 
> asked to pick a file format and none of them seem to work.
> Can you help me please?
> Take care,
> Susen

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