SUMMARY When trying to open a PDF file (by clicking on it) in a folder whose name starts with "#" on a USB thumbdrive, it will instead open and display images that are on the same thumbdrive (tried with .jpeg and .jpg). The same PDF can be open normally in the "file/open" menu. STEPS TO REPRODUCE 1. Create a new folder on a USB drive and name it # 2. Place a PDF file in this folder and a few JPG files anywhere on the same thumbdrive 3. Open the PDF by clicking on it OBSERVED RESULT The images are displayed EXPECTED RESULT The PDF should be displayed SOFTWARE/OS VERSIONS Windows 11 Professional, Version 21H2 (build 22000.1098) (Okular's bug report window indicates Windows 10 Version 2009 (x86_64). I don't know if it's relevant) ADDITIONAL INFORMATION