I can't open dmg files anymore

I JUST got this problem. I have been using my mac for a couple of years now. My Mac is a Macbook Pro, Version 10.7.2 (Lion)
Recently, I have been unable to open Dmg files, whenever I double click it, I get a message saying:
"Warning, the following disk images couldn't be opened"
"Reason: legacy image should be converted"
I never had this problem before, so why am I getting it now? How do I fix this?

https://discussions.apple.com/thread/3158789?start=0&tstart=0

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Can't open DMG-files

I can't open DMG-files anymore because OS X associates dmg-files with another program. Usually when I opend .dmg files a "virtual disk" opened, now another program starts.
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Mac Mini Mac OS X (10.4.5)

580/3026
Hi mrtn87,
welcome to Discussions!
/System/Library/CoreServices/BOMArchiveHelper.app opens .zip files,
and
/System/Library/CoreServices/DiskImageMounter.app opens the .dmg files.
If you have OnyX, you can try running the "Reset LaunchServices Database" and "Reset links between documents and applications" tasks, see if the problem disappears.
Here is a Terminal command you can try if you don't have OnyX (or one of the usual utilities):
/System/Library/Frameworks/ApplicationServices.framework/\
Frameworks/LaunchServices.framework/Support/lsregister \
-kill -r -domain local -domain system -domain user
Let us know.
Axl

Help! Can't open .dmg files suddenly, and can't find stuffit expander application!

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Do you mean DiskImageMounter was chosen or not?
No change on that .dmg or on on others?
If you want to apply DiskImageMounter to all you have to choose "Change All".
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Also, George Orville has some interesting advice in this thread
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-mj
[email protected]
Message was edited by: macjack

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I have a brand new iMac updated OS X and I can't open dmg files. It appears that I don't have DiskImageMounter. What do I need to do?

The path for DiskImageMounter is Mac HD/System/Library/CoreServices.
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I can't open dmg files on my new MB Air. What can I do?

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Both MindNode Pro and Tree are bought in Apples App Store, and I have tried re-installing both. That move didn't sort things out... By the way, I can't open opml files on my iMac anymore either (Snow Leopard), which is more or less a mirror app wise of my Macbook Pro (Lion 10.7.4).
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Darn...I thought that would do the trick.
Given the other problems you mention, more and more, it seems a reinstall of the OS, using Archive and Install is going to be necessary. Have you ever done an Archive & Install of the OS? Important you carefully read the description of the process. If you are uncertain, I find the Take Control Upgrading to Tiger E-zine to be a very helpful guide.
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Message was edited by: Hawaiian_Starman

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HI,
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thanks

1. Yes.
3. Well, there are two aspects: corruption of the hard drive; or corruption of the .dmg file. For the latter you may try re-downloading the file. For the former you need to try repairing the hard drive.
Repair the Hard Drive - Lion
Boot from your Lion Recovery HD. When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported, then quit DU and return to the main menu. Select Restart from the Apple menu.
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Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
2. To reinstall Lion:
Reinstalling Lion Without the Installer
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alterhatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
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When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion and click on the Continue button.
On your computer Lion reinstalls via Internet Recovery, so be sure your internet connection is functioning.

Can not open DMG file ... a Cautionary Tale

Recently obtained a CD with a new OS X app. I double-clicked on it, but nothing happened. So I double-clicked on it again. This time I got an error message saying: "Can not open a Windows program." Tried double clicking on it again. Same message. I was non-plused! Tried several more times.
Before putting a call into Apple Care, I started closing the windows on the screen. When I closed what I thought was the last window, 1 Dialog Box appeared that had been behind all the other windows. It stated: "Please enter your Serial Number".
Two obvious questions:
1. Why was the dialog box for a current activity, hidden behind all other windows?
2. Why, when I tried to execute it again, did the dialog box not come to the front?
Perhaps I am the only 27" iMac user with many windows open at a given time? Don't know ... but please be cautioned.
Chuck

I have many programs open all the time, Safarie, Finder. Mail, etc., and use 8 different Desktops. If this were the problem, it would have occurred long ago. The program I was trying to install was from Adobe: Photoshop Lightroom.
a brody wrote:
... Either way, the program in question should know to switch desktops when activated. ...
You are right. I shall contact Adobe and, at least, make them aware of this.
Thanks, Chuck

I can't open dmg files anymore

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