Many times people who wants to look a movie on the computer still mounts the image file to a Virtual Disc. If you don't want to have to install Virtual Disc's or programs like Poweriso, Alcohol 120%, Deamon Tools etc. you can do the following: The kind of image files on which you can use this little trick will be updated as soon I find a new one on which it works.
.iso Files - Simple unpack it with Winrar, you'll get an VIDEO_TS Folder with al the DVD files
.img Files - Change the extension in .iso. Ignore the warning and then again unpack it with Winrar.
I hope it will be usefull for some of you.