If you cannot edit or delete it, try prefixing your command with sudo (e.g., sudo rm "dk test.txt" ).
Many tutorials use files like this to demonstrate compression tools like pigz or zip : dk test.txt
Right-click the file and select Send to > Compressed (zipped) folder to create a backup. If you cannot edit or delete it, try
Use the touch command or a redirect to quickly generate the file in your current directory: touch "dk test.txt" (Creates an empty file) dk test.txt