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

My iMac is currently running on Mac os x 10.5.8, **out of nowhere my computer can't open dmg files. I can't seem to find the stuffit expander application anywhere in my hard drive either, which usually opens these files. Is there another application that can open dmg files? Help Please! I need to open multiple dmg files tonight and can't figure out a way around this. Downloading/running a new stuffit expander application also happens to be a .dmg file. If anyone can help me I'd appreciate it so much!

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".
EDIT: Also, Repair Permissions from /Applications/Utilities/ Disk Utility.
Also, George Orville has some interesting advice in this thread
Note this advice is for 10.3 but much of it will apply here.
-mj
[email protected]
Message was edited by: macjack

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welcome to Discussions!
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/System/Library/Frameworks/ApplicationServices.framework/\
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-kill -r -domain local -domain system -domain user
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Message was edited by: Hawaiian_Starman

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Can't open .DMG files in Mac OS X 10.7..what can i do?

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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.

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

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