Cannot open .dmg files, Invalid checksum...

Im getting the problem Invalid checksum with all downloaded .img files saying its unable to verify the file.
Have tried the update pack from the mac page, firefox installer and others but none works.
I thought the problem would be the hdd but i tried another hdd and got the same problem.
Have tried with both Stuffit expander and Disk Copy.
I have tried reinstalling the OS on both harddrives and still get the same problem.
Any clues what the problem might be?
Thanks!

I have the same problem. In fact iTunes will not run or update on my machine. All software updates fail with this same error.

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Cannot open dmg files in mavericks

After installing Mavericks on my iMac I cannot open dmg-files. All that happens is that the system tells me "The following disk images couldn't be opened", with the reason "no mountable file systems".
Now, all I can find when discussing this issue is that "your download is corrupted" or "check your disk" or "reinstall Mavericks!". I have checked and rechecked the files, they are complete and should work. My disk is checked and I have reinstalled Mavericks but nothing happens.
It seems to be a fairly new/rare problem, I can't find any discussion on this problem elsewhere...

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
Both newly downloaded dmg files and ones that were downloaded and sucessfully opened under a previous version of OS X cannot be opened now
I have two user accounts on the same machine. On one I can open dmgs without problem. On the other I get the error.
I'm using the same browser (chrome) on both accounts to download the same disk image, with different results.
Both accounts are admin accounts
I transferred the disk image that opened properly on my main account to the second account's ~/public/drop box folder and the second account could not open the image.

Cannot open DMG files

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.
(When I download, I am getting two separate files for each, one dmg, and one dmg.part, which the OS seems to think is a quicktime movie file. Is this normal? I don't remember.) Anyway, this is the error:
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:
Running Disk Permissions Repair
Restarting
Opening from Stuffit
Opening from Disk Utilities
Opening from Mount (downloaded from Internet)
I thought that I read that downloading the Combo Install would fix the problem with the Disk Mount, but I cannot open that either.
What should I do?
I appreciate any help!

the different type of file shttp://www.adobe.com/support/downloads/product.jsp?product=39&platform=Macintosh

I cannot open dmg files with Yosemite

So installed Yosemite. All seemed fine but
I now cannot open dmg files. If I double click on them, nothing happens. If I say open with "diskimagemounter" nothing happens. If I say open with Disk Utility it says wrong version of Disk Utility. If I move them back to a computer with Mavericks, they open fine. Repaired permissions and no change.
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.
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 OS X: Select Reinstall OS X and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
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.

My Safari can´t open .dmg files after downloading

I updated to Mac OS X 4.9. But since this update, Safari cannot open .dmg files after downloading! On 10.4.8 it was not a problem. What can I do?
eMac G4 PPC Mac OS X (10.4.9)

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.
Once you reinstall the OS, then you can upgrade to 10.4.8 using the combo update, repairing permissions via Disk Utility in your Utilities folder when complete.
One question: Not sure why you have run into all these problems on the 10.4.9 upgrade. It worked without problem for me. Anything unusual happen during the install?
Message was edited by: Hawaiian_Starman

I cannot open pdf files in safari. It tells me first character is invalid. I have deleted plug-ins and reinstalled program. HELP

cannot open PDF files in safari. It tells me first character is invalid - I have deleted plug-ins and reinstalled the program.

HI..
If you are using Adobe Reader ...
Try uninstalling the current copy of Adobe Reader first.
Best to use a utility to do this to make sure all the associated files are removed as well > Download AppCleaner for Mac - Uninstall your apps easily. MacUpdate.com
Then reinstall > http://get.adobe.com/reader/
Quit then relaunch Safari to test.

XML Report output giving error "word cannot open the file because....

Hi All,
Greetings!
I have a standard report, 'Payables Posted Invoice Register".
The report was going in to warning beacuse of some Invalid characters in the Data.
I corrected the invalid characters and then ran the report ; it completed fine.
But now when I try to open the report output, the output is not getting open but its allowing me to save the file.
When I save it on my local machine and try to open it, I am getting an error as "word cannot open the file because it is larger than 512 megabytes".
The document size showing is 664MB when I saved it on my machine. And the output type of the report is RTF and not PDF.
Can anybody please help?
Thanks,
Sachin

not sure, if the Microsoft word has limitation of file size.

I have office 2004 on my Imac. Cannot open .xlsx files. Anyone know of a patch for this

I have office 2004 on my Imac. Cannot open .xlsx files. Anyone know of a patch for this

Mac users using Word 2004 who receive a Word 2008 for Mac, (or Word 2007 for Windows) document, will not be albe to read this without having the Open XML Converter installed, which can be downloaded from Microsoft.
Go to this page:
http://www.microsoft.com/mac/downloads.mspx
and click on the right under Most Popular, 'Open XML File Format Converter for Mac 1.0.2'
This opens a window at the bottom of the page. Scroll that to the bottom and click on English.dmg, and it will download for you as a disk image, which can be installed in the usual way.
After installation you can open and read .xml formatted Word 2008 documents in Word 2004.
Update: This link http://support.microsoft.com/kb/976831 takes you to a newer version 1.1.3 (released Nov 10, 2009).

Excel cannot open the file because the file format or file extension is not valid

pls help

Hi,
In regarding of the issue, please provide us more information to assist you better.
Which Office version are you using? Office 2013 or other.
Did the issue occur with the special file or every file?
Then, based on your error message, this problem has been confirmed to be caused by malware on the affected machine. There are now two known variants of malware which causes this problem: Win32/Crilock.A and
Win32/Buma!rts. They have both been identified as a new family of ransomware.
In order to clean your machine, run Microsoft Safety Scanner (http://www.microsoft.com/security/scanner/en-us/default.aspx). If infected, Safety Scanner should clean the virus from
the system, however it will not repair corrupted files. You will still need to restore those from a backup. A detailed analysis of affected files submitted to Microsoft for investigation has revealed the files are encrypted with a private
and public key. The files cannot be recovered without the private key, which is more than likely held by the attacker. The premise of ransomware is such that if a person pays the ransom the key is provided to "unlock" the files.
For more detail information, please refer to the following link:
http://blogs.technet.com/b/the_microsoft_excel_support_team_blog/archive/2013/09/07/quot-cannot-open-the-file-because-the-file-format-or-extension-is-invalid-quot-opening-office-files.aspx
Regards,
George Zhao
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in
Office programs.

Excel cannot open the file beacuse the file format or file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file [help]

Hi,
I have a excel file that I have been using since beginning of year.
Yesterday, I tried to open it but a message comes out "
Excel cannot open the file beacuse the file format or file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file"
After I click yes, the page is blank. The file is about 400kb in size.
I have try open and repair and third party repair program and not working also.
I would appreciate a lot if you can help me.
Thank you very much.

Per your post, this problem might be caused by malware on the affected machine.
http://blogs.technet.com/b/the_microsoft_excel_support_team_blog/archive/2013/09/07/quot-cannot-open-the-file-because-the-file-format-or-extension-is-invalid-quot-opening-office-files.aspx
In order to clean your machine, run Microsoft Safety Scanner (http://www.microsoft.com/security/scanner/en-us/default.aspx) to kill the malware, and then repair Excel file itself.
If this is not the case, feel free to post back and let me know. Thanks.
Tony Chen
TechNet Community Support
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

Excel cannot open the file 'file.xlsx' because the file format

Every now and then, when I try opening an Excel file, I get a message saying that "Excel cannot open the file 'file.xlsx' because the file format or the file extension is not valid. Verify that the file has not been corrupted and that the file extension
matches the format of the file.

Hi,
Which Excel version are you using? As far as I know, this issue is caused by malware on the affected machine.There are now two known variants of malware which causes this problem: Win32/Crilock.A and
Win32/Buma!rts. They have both been identified as a new family of ransomware.
We'd better clean your machine, run Microsoft Safety Scanner (http://www.microsoft.com/security/scanner/en-us/default.aspx).
For more detail information, please refer to the following link:
http://blogs.technet.com/b/the_microsoft_excel_support_team_blog/archive/2013/09/07/quot-cannot-open-the-file-because-the-file-format-or-extension-is-invalid-quot-opening-office-files.aspx
Regards,
George Zhao
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs.

I have Elements 8. I have bought A Nikon D750 and take Raw files. I have downloaded Raw 8.8 file converter, but cannot open Raw files

I have Elements 8. Raw converter for my previous Nikon D300s worked ok. Now I have D750 cannot open Raw files. I have downloaded lastest Raw converter from Adobe 8.8
Still cannot open Raw file. Get message "cannot open as it is wrong type of file" How do I get the latest Raw converter to work with Elements 8? Any info gratefully received.

Are you saying you converted from NEF to DNG? If so, after you convert your raw files to the Adobe universal Raw format, the files will open in all versions of PSE (keep your originals as backups and for use in the camera manufactures software)
Windows download (.exe file) click here DNG Converter 8.8
Mac download (.dmg file) click here DNG Converter 8.8
You can convert a whole folder of raw images in one click. See this quick video tutorial:
You Tube click here for DNG Converter tutorial

Canon 7d mark 2, raw file updater 8.7.1 cannot open raw files!

Can anyone help!! I have the Canon 7D mark 2 and have downloaded the raw file updater 8.7.1 and still cannot open raw files on my macbook.

Unfortunately your software pre-dates the camera. ACR 8.7.1 is only compatible with PSE13. But it is possible to download and install the free DNG converter to convert your raw files to the Adobe universal Raw format and the files will open in all versions of PSE (keep your originals as backups and for use in the camera manufactures software)
Windows download (.exe file) click here DNG Converter 8.7.1
Mac download (.dmg file) click here DNG Converter 8.7.1
You can convert a whole folder of raw images in one click. See this quick video tutorial:
You Tube click here for DNG Converter tutorial

Cannot open JPEG files in PE9

Cannot open JPEG files in PE9 "because an unknown or invalid JPEG marker type is found"

it wants
to default into a JPEG file and there is a JPEG marker on the end of the
saved file even when I select Photoshop format.
I would really like to see a screenshot of the save as window, since any time you have a layered file PSE fights you every step of the way and makes you save as a copy when you choose jpeg as the format.

I downloaded mountain lion and then the new office suite (word, ppt, excel) but now when I try to display one of my ppt's it says 'ppt cannot open the file...the file may be corrupt, in use, not a type recognized by ppt etc.." how can I fix it?? HELP

I downloaded mountain lion and then the new office suite (word, ppt, excel) but now when I try to display one of my ppt's it says 'ppt cannot open the file...the file may be corrupt, in use, not a type recognized by ppt etc.." how can I fix it?? HELP

Did you try to open teh fle by double-clicking its icon? If the file was made with an older version of Office, you may get that message. Try opeing PP and, from its "File" menu, see if you can open the ppt. I've foundthat often gets around that message and then yo ucan save the file from the newer version.
If that doesn't work, consider asking in the Microsoft Office: Mac forums here:
Office for Mac forums
PowerPoint is not an Apple product and it seems a lot of people around here avoid Office.

Cannot open .dmg files, Invalid checksum...

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