The virtual drive software is DAEMON Tools Ultra 5.8.
I double-clicked the ISO file. In the previous version, the directory tree automatically created a virtual CD-ROM drive and opened the file. After removal, the CD of the directory tree is automatically deleted, and the opened directory is returned.
But in 12.20.5, there is no change after double-clicking, but continue to double-click to open the disc. There is no response after the removal, the disc can only be cleared after restarting opus.