You can make a difference in the Apple Support Community!

When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.

Unable to open .DMG files on old iMac

Today I wanted to open my .dmg files and I could not open any of them on the old iMac computer, but I can open them on the new computer - strange. I have all the passwords as they are in Apple key Chain - but none of them I can open on the old computer - how is that ???


[Re-Titled by Moderator]

iMac 24″, macOS 15.1

Posted on Nov 6, 2024 9:55 AM

Reply
4 replies

Nov 6, 2024 11:25 AM in response to Old Toad

I created the .dmg s using Disk Utility . Strange also that on the new Mac there are only AES 128 encrypting ,on the Old Mac I can still use AES 256 encryption .I have a mobile internet ,which I deem it most bad ewer 5G mobile internet ,I have a router of course ,it is a mobile router. Big companies has this mobile internet - and in this house there are no FIBRE internet - which is indeed most strange too .


I can open all the .dmg files on my new Mac ,but not on the old one . Also the old Mac has a better passwords Generator and it generates short passwords which I deem somewhat risky . - a lots of things is strange .


In Finder double clicking on the file - then it says : The disc image could not be opened.Could not load file or wrong format on UDIF - image .


Klicking on the Desktop ,it says that ,Disc image cannot be opened as Original is not found , as I remember.


Unable to open .DMG files on old iMac

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.