What doeas the question mark in a file icon means in Intellij?

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I didn't found anything in the official documentation.

I am asking this because these two files have the .pdf extention, maybe the IDE can't recognize them

icons intellij-idea
1 Answers

This icon denotes the "Unknown" to IDE file type. To be able to open such file from IDE by the external application, please add the extension pattern here: File Types

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