I can't open files with extension .dmg


Hi! I want to tell a problem. Two weeks ago i Installed High Sierra. I've version 10.12.6 and today after two weeks my mac can't read file .dmg. It doesn't report any error, just doesn't open it. Any ideas?


Rosie Moderator
Staff member
A .dmg file is a compressed file similar to a .zip allowing a quick download of an installer. Have you checked your desktop for what appears to be an icon of a drive or DVD? Check your download folder where the .dmg is located.

Is this .dmg from a download from a trusted site? It could very well be corrupt or empty (no files in it).

You can try using Disk Utility to force open the .dmg. If there is a problem with that file, it will tell you.