Illustrator won't open more than one file.
With version 23.0.1, Illustrator will permit to open only one single file. The first file can be opened by any method, any subsequent file can only be opened using "File/Open" command. Using Windows Explorer or Drag&Drop does not work! and will freeze Illustrator; ending the application is only possible using the Windows Task Manager.
I'm running Illustrator CC (23.0.1 64-bit) ond Windows 10 Enterprise (10.0.16299).
THX for fixing this!
Please get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html . Since this is not a generic issue that we can reproduce at our end, we will need someone to look into your machine to figure out what is going on here.