Since this worked previously for him, if it was indeed warez he would realize that simply making an image of a movie DVD does not mean it will work since there are such measures as block encryption, block shifting, and combinations of other techniques that would, in most cases, result in a useless image without help from tools like daemon tools.
You allude, with the legal comment, that this might possibly be warez. Aolor DMG to ISO Converter for Mac is a super easy-to-use Mac disk utility that allows users to create Windows disk image ISO file from Mac disk image file DMG in only 3 steps: import DMG, set output directory and start the DMG to ISO conversion. With this program, you will be able to convert the disk images on the Mac platform into a manner that it can be accessed on the Windows platform, and that is the ISO format. He did his homework and found out there was a difference between the two, and was pointing out the technical differentiation between the working and the non working. Convert Dmg To Bootable Iso Windows Aolor DMG to ISO Converter is an app for the Mac platform that offers enhanced management of files as well as a folder. The only difference is DMG is compatible with Mac computers and ISO is compatible with Windows computers. You can compare DMG files with ISO files in Windows computers. Telling him to just click on it is completely missing the point that he was having issues with that. Convert Dmg File To Iso Windows Dmg To Iso DMG file format is one of the most well-known container format to distribute and compress software on Mac operating system. The point being made was that there is a technical difference in the two formats that was causing your solution not to work.