Problem opening .dmg files?

Hi all,
I've recently been having problems opening .dmg files -- specifically for a recent Adobe update, and the latest VLC update.
Checking with their support, it seems that it's not a problem that others are experiencing.
I get the following message:
I'm on the 2007 27" iMac, with my OS (SL) being up to date.
Any suggestions?
Thx!

Could be either.
Check out your own stuff as far as you can. Your router diagnostics page should be able to tell you what sort of download speed you're getting, or you can use SpeedTest http://speedtest.net/
Check your phone line from the main terminal to the router for loose connections, kinks that may be hiding broken wires and such. Check or replace the line filter that seperates the modem line from the phone.
Then get your ISP to check out their end, and the phone company likewise.
Hope you can find the source.

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I'm having a problem opening my files …..for example if i want to download something off the internet and run it after it always opens in Textedit which is annoying…..other programs open fine which are dmg but the exe files won't run….i need help

If you are in fact running Mac OS 9 or earlier, which is from 2001 or earlier, .dmg files are disk image files like the .smi files used under Mac OS 9, but they are only Mac OS X compatible. They are frequently used to store Mac OS X only installer disk image files. .exe files are are Windows and MS-DOS executable files which can only run with Windows or DOS virtualization:
https://discussions.apple.com/docs/DOC-2741
Most Mac OS 9 programs you'll be able to download either have a .sea, .sit, or .hqx suffix in their file name and are able to be opened with the old Mac OS 9 copy of Stuffit Expander.
If you are using another operating system, please go to Apple menu -> About this Mac and tell us what you are running. You posted to the Mac OS 9 forum, hence my response. If there is an X in the name, you posted to the wrong forum, and I'll have this post redirected and try to answer if I have time.

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.
I tried the Open with (Openen met in Dutch) function, but I don't know which program I have to choose. When I have this problem on a Windows PC I just select explorer.exe. Which file do I have to choose on my Mac? Or is there another way to solve this?
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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
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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"
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https://discussions.apple.com/thread/3158789?start=0&tstart=0

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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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I'm having the same problem. I don't have any answers. But here's some information about what I'm seeing that might help someone sort this out.
I recently upgraded to Mavericks
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I'm using the same browser (chrome) on both accounts to download the same disk image, with different results.
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Hello. I cannot open DMG files. I have had the problem with a download of Adobe Photoshop and the Combo Update for Mac OS 10.4.10. I have re-downloaded both files.
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The following disk images failed to mount; name of file, not recognized.
I have tried most of the fixes found on the site, and none of them have worked for me. Here is a short run down of what I have tried:
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Restarting
Opening from Stuffit
Opening from Disk Utilities
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I thought that I read that downloading the Combo Install would fix the problem with the Disk Mount, but I cannot open that either.
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the different type of file shttp://www.adobe.com/support/downloads/product.jsp?product=39&platform=Macintosh

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I installed it through the adobe reader website for free. And even though it says 'by clicking "install now" you are agreeing to accept the user licence agreement terms and conditions' it still says i need to accept the T&C's.
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Please contact me via email direct ASAP at....
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Message was edited by: nick khzouz

Adobe Reader PDF problems wrote:
"Before viewing PDF documents in this browser you must launch adobe reader and accept the End User Licence Agreement, then quit and relaunch the browser."
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Are your clients using Adobe Reader on Mac, or the built-in Mac OS Preview? Preview does NOT support the full PDF standard :(.
From: Adobe Forums <[email protected]<mailto:[email protected]>>
Reply-To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>>
Date: Mon, 26 Sep 2011 15:04:18 -0700
To: Leonard Rosenthol <[email protected]<mailto:[email protected]>>
Subject: Problems opening .pdf files created in Windows in MAC
Problems opening .pdf files created in Windows in MAC
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we store documents in our portal in KM. When I use pdf-files that where not saved with Office2007 tools I get the problem, that I can open the file once. If I open it the second time I get the error message "file doesn't start with "%PDF-". and the file will not be opend. If I delete the temporary files in the internet explorer, the file can be opended, again.
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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".
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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Yes, I finally got it working using number 2:-) Thank you very much
2013/8/1 Pat Willener <[email protected]>
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What do I do please?

Reinstalling OS X Without Erasing the Drive
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. 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.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
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Reinstall OS X: Select Reinstall OS X and click on the Continue button.
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Download and reinstall the 10.10.1 update.
Also see:
Reinstall OS X Without Erasing the Drive
OS X Yosemite- Reinstall OS X
Note: You will need an active Internet connection. I suggest using Ethernet
if possible because it is three times faster than wireless.

Problem opening .dmg files?

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