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
A symbol is a semantic element in some model, e.g., language or framework model. The IntelliJ Platform uses Symbol to represent symbols, and Symbol serves as a link between Platform APIs, such as navigation, finding usages, or renaming.
Each file format in IntelliJ IDEA has a dedicated icon. In the Project tool window ( Alt+1 ), these icons help you quickly identify with what kind of files you are working with.
Press Ctrl+Alt+S to open the IDE settings and select Editor | File Types. Click Associate File Types with IntelliJ IDEA and select the file extensions you want to open with the IDE. Click OK and close the dialog.
The blue dot package icon is an indicator that the Web Facet has been configured correctly and is usually seen on the web source directory src/main/webapp .
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:
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