Issue #1050 invalid
Sushil K
created an issue

I am getting a warning message that says "openpyxl/reader/ UserWarning: Unknown extension is not supported and will be removed"

I've traced the extension value to be 64002731-A6B0-56B0-2670-7721B7C09600.

It shows up when I open a file that was saved in Excel for Mac 2011. My version is 14.6.8.

Since it's a warning it doesn't halt execution but it would be nice not to receive it. I don't understand enough about what these do to want to touch the code myself.

Comments (1)

  1. CharlieC

    The warning tells you that something is being removed from the file. The library is doing this out of courtesy but can't really provide more information. You can control the display of warnings when running your code.

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