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pdog1967 pdog1967 is offline
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Default In excel what does a file ending with .xlsx mean?

I have created and saved several files in Excel. I then sent them to a friend
at a different company. I was then notified that they could open all of the
files that were .xls but the one that was .xlsx they could not open. How did
I get the file saved with the extra x, and what does that mean?