1. Install "Furius ISO Mount" (in the Ubuntu Package Manager)
2. Run "Furius ISO Mount" and:
-Select Image File
-Click Mount
3. (By default, the image will be mounted in your home directory: /home /user_name/ name_disc_iso Go to the directory with a mounted image
4. In Nautilus: Select the "Go"> "Location"
5. Copy the location (Ctrl + C)
6. Run the installer, the game -PlayOnLinux-
7. When the installer asks for CD / DVD, select "Other"
8. Paste the copied ISO directory location and click "Next"

Enjoy!

It's just a guide for the backup program/​game. I DO NOT SUPPORT PIRACY!
If you want, I write a similar guide for NRG, MDS, MDF, etc.