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- An Utility to Unassociate File Types in Windows 7 and Vista
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- Windows Vista
- An Utility to Unassociate File Types in Windows 7 and Vista
An Utility to Unassociate File Types in Windows 7 and Vista
- Copyright © 2008 Ramesh Srinivasan
- Utilities , Windows Vista , Windows 7
The utility discussed in this article helps you unassociate a file type quickly in your Windows Vista or Windows 7 PC. Windows 7 & Vista do not provide a GUI option to unassociate file types. That's the reason I wrote this simple tool.
Unassociate file types in Windows 7 & Windows Vista
- Download unassoc.zip from the Attachments section, and save to Desktop
- Extract the contents to a folder and run the file unassoc.exe
- Select the file type from the list
- Click Remove file association (User)
The user-specific association for the chosen file type is now removed from the registry. The system will now use the global file association settings.
Screenshot

More information
| Command | Description |
| Remove file association (User) | Removes the user-specific association (via the Open With dialog) for the chosen file type. Note that this button will remain dimmed if there is no user-specific association for the file type. |
| Delete file type | Deletes the file type completely from the registry. Both the user-specific and global associations for the chosen file type is removed. |
| Refresh list | Refreshes the list box contents. |
Attachments
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72 Responses to "An Utility to Unassociate File Types in Windows 7 and Vista" 
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said this on 05 Sep 2007 7:50:47 PM PST
When you say it removes the file type from the registry, do you mean it resets it to the default, or that it makes it so Vista doesn't know what to do with the file?
Editor's note: The file type association is deleted from the registry, and Vista treats it as unknown file type.
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said this on 14 Sep 2007 12:50:30 AM PST
I highly recommend this app and others on this site to all others who have spent countless hours and dollars browsing the apps available in certain computer books and publications, when half are Vista incompatible, and a program like this is a godsend for incredibly useful and necessary functions on Vista that unfortunately, if they can be found, you have to pay good dollar for when all you have to do here is download and it is incredibly easy to use. I can't believe it took me so long to find this site and apps, so save yourselves the time and give it a run. I really highly recommend it, and actually have noticed others apps on this site for some of the most obviously needed fixes in Vista that I could find nowhere, and I mean nowhere else after hours of browsing the web. So if you're like me, a guy who was looking for a fix to exactly this problem, only to come across some site where the admin. says he'll fix your dlls "if you.." just go here. Honestly. I'm bookmarking this site.
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said this on 21 Sep 2007 7:18:35 AM PST
I can't run this program! Keeps on telling me about that it can only run with administrative priviliges, which I have.......
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said this on 26 Sep 2007 2:47:11 AM PST
I can't run this program Also! Keeps telling me about administrative priviliges, which I have too like the above poster.........
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said this on 10 Oct 2007 5:26:36 AM PST
Thank you so much!
I associated shortcut files (lnk) to iexplorer.exe and it was a mess. I couldn't fix it through the Vista GUI and your program worked great.
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said this on 13 Oct 2007 10:55:09 AM PST
Thanks! This was a very helpful tool, and may have saved me a possible reformat in a forthcoming moment of frustration :)
Thanks again.
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said this on 18 Oct 2007 6:54:05 AM PST
Thank you so much this has saved me hours of frustration.
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said this on 24 Oct 2007 3:24:55 PM PST
Simple and effective. This program does what should have been a integrated function in Vista. Very useful.
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said this on 31 Oct 2007 2:47:03 PM PST
Looking for an answer I found more and more questions. The Solution of pdf-opening with windows mail I found here. Thanks a lot!!! You guys are great!
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said this on 01 Nov 2007 7:26:14 AM PST
This is really a great program. I met a problem with the .lnk files, that all those type files didn't work any more. After solving as you said, it recovered. Thanks a lot!
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said this on 12 Dec 2007 1:44:01 PM PST
After 3 hours of searching the net for clue you saved the evening.
Thank you wery much for this soft.
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said this on 24 Dec 2007 6:00:23 PM PST
Hello,
This program works like a charm, You just type in .*insert extension here" and you can do everything you'd want to with the extension. I really wish this could've been included in Vista as it's well worthy of a place in vista. I'll be recommending it to everyone
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said this on 29 Dec 2007 3:04:25 PM PST
Great little program. Luckily I found it on my first search as it saved me a lot of hassle because of 1 little misclick. I can't believe that the Vista OS won't let you manually un-associate a file type.
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said this on 04 Jan 2008 2:52:29 PM PST
THANKS A BILLION!
It totally fixed my HTM and HTML extension problems!
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said this on 13 Jan 2008 1:15:07 AM PST
God bless you and you whole family for this useful and cool little program!
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said this on 11 Feb 2008 10:29:58 PM PST
Excellent. I'm not a computer guru by any stretch of the imagination, I was getting ticked because .pdf files wouldn't open from my email or other programs that were supposed to autolaunch Reader. Many thanks.
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said this on 15 Mar 2008 5:20:26 PM PST
Yesssssssssss! Just what I was looking for.
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said this on 19 Mar 2008 2:07:20 PM PST
Awesome
This fixed my problem of not being able to open .doc files directly from Windows Mail!
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said this on 19 Mar 2008 6:55:33 PM PST
Awesome! You've saved me quite a bit of frustration with this little tool.
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said this on 22 Mar 2008 3:01:20 PM PST
This is a great tool. I had trouble mounting ISO files with Alocohol's software ..and my unassociating the .iso files .. I was finally able to make it work!
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said this on 08 Apr 2008 10:50:54 AM PST
Good site! A clean intelligent layout. Well done.
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said this on 13 Apr 2008 10:21:24 PM PST
The tool fixed my problem. My web browser stopped working because the xps file type had become associated by default with an application. I tried to open an xps document file, for which Vista recommended the xps viewer application. After that, Vista remembered that as the default application and the browser would no longer work (I think that the browser uses xps with xml file types). Thanks for the tool!!!
Is there any way to also remove the xps viewer application from appearing in the "recommended applications" that show up in the "open with" selection in the context menu? Should I delete the xps file type entirely from the computer?
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said this on 13 Apr 2008 10:31:19 PM PST
The tool worked great! Thanks so much!!
However, Vista still remembers the program(s) that had been set as the default program. Is there a way to also remove the "recommended" programs from the "open with" selection within the context menu and also from the "opens with" section in the file properties window? Should I delete the file type (xps) from the computer entirely?
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said this on 22 Apr 2008 2:53:03 AM PST
Nice job on this Proggie man! XP has it built in, but I was going crazy trying to find it in vista! I guess I'm not nuts because it wasn't there to begin with. Thanks again and keep up the good work!
Peace,
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said this on 22 Apr 2008 10:01:18 AM PST
Yeeeepeeeeeeee! Thanks sew very much!
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said this on 15 May 2008 5:36:38 PM PST
Thanks a lot!
I accidentally associated a .dll file with Sony ACID and this was very annoying. Now it is all back to normal.
Thanks again.
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said this on 23 May 2008 7:29:48 AM PST
Thanks for this cool program!!!! I finally removed the association of excel files from ms works...
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said this on 22 Jun 2008 7:51:25 AM PST
Thank you! You have definitely saved my life!
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said this on 24 Jun 2008 7:19:35 PM PST
After hours (not willing to admit how many) I finally found your site and this nifty utility - 3 minutes later problem solved.
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said this on 05 Jul 2008 6:05:48 PM PST
WOW! Thank you so much! I was having terrible problems with my Vista Installer (.msi) files and associated them throught the Windows32 folder msiexec file and still couldnt do anything...using this tool I deleted all .msi file associations and clicked my program I was downloading and presto...installer starts and program installs! Thank you so much!
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said this on 08 Aug 2008 2:00:41 AM PST
Thank you very much for writing this utility. I was stuck and it removed the file association quickly and with ease. Your time and skills are very much appreciated. Many thanks!!!!
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said this on 21 Aug 2008 7:46:24 AM PST
This utility gives the same results of the DOS commands:
assoc .
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said this on 22 Aug 2008 7:29:33 PM PST
Thanks a lot. I have spent 4 hours just to find what you offered on this site. The lucky one is that who type the following in google search: unassosiate dll file. I did it so and found your webpage where I found the perfect solution.
It was of great help. Never forget my 4 hours night search.
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said this on 29 Aug 2008 8:10:44 PM PST
Really Works!! 100% Recommended
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said this on 10 Sep 2008 8:49:56 PM PST
I am the admin on this PC, and I right-clicked and "Run Utility as Administrator", however for all file types the Remove File Associate (User) button remains grayed out.
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said this on 13 Sep 2008 4:50:04 PM PST
Thank you. I'm not very computer literate (older generation), however, I was extremely pleased when I was able to follow your instructions and successfully solve my problem without having to call a computer expert to bail me out! WOW! I'm impressed. Keep up the good work.
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said this on 22 Sep 2008 9:43:10 AM PST
button stiill grayed out. have admin rights too! Any help? I'm desperate!
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said this on 04 Oct 2008 2:22:57 AM PST
i was unable to open .cab-files with vista-standard (instead of winACE). i tried at least 100 suggestions, i imported different .regs, tried to unregister and reregister cabview.dll (which fails in vista), i searched and edited my registry manually, nothing helped...
but your utility worked at first try, i performed "remove file association (user) on .cab-files and voila!
perfect! congrats! and thanks!
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said this on 11 Oct 2008 5:09:39 AM PST
Thank UUUUUU so much, i have been searching for this solution for a week and i just found it now. i associated my compiler file to a note pad and didt know how to unassociate it back to 'unknown application'. Even the computer programmers in my college couldnt find a solution and i was so frustrated and was thinking even buying a new computer as i needed the program for my study. Hope many people will save their day with this. Thanks again.
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said this on 11 Oct 2008 2:09:20 PM PST
thanks a lot for this software.
My word xp was not working with vista and i could not open word documents and this did the trick.
Thanks
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said this on 15 Oct 2008 3:02:25 PM PST
It worked for me very well, Thank you.
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said this on 20 Oct 2008 6:31:38 PM PST
Everytime i click on the download link (unassoc_1_3.zip under attachments) it brings me to this same page everytime.
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said this on 23 Oct 2008 5:28:41 AM PST
THANK YOU THIS REALLY WORKED.........
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said this on 26 Oct 2008 4:21:04 PM PST
Works great! Thanks for writing this app! Saved me a lot of headache.
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said this on 30 Oct 2008 12:47:23 AM PST
I accidentally associated .cur and .ani with wordpad, made all my custom cursors show a "text document" icon.
This Program works wonders, and saved Microsoft from my wrath! ^^
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said this on 06 Nov 2008 2:38:30 AM PST
Absolutely brilliant, this app has fixed in seconds what I've just spent over an hour trying to resolve.
Thanks a million for this :)
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said this on 07 Dec 2008 8:11:12 PM PST
Thanks you soooo much. I've been trying to find a way to unassociate my .wtf file because I accidentally associated it Notepad. This program is amazing! Once again, Thank you so much.
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said this on 16 Feb 2009 6:18:02 AM PST
I associated my sfv files to open with windows media player. i tried this program but when i select sfv files it doesn't allow me to "remove file association". The button is gray and unclickable. I'm pretty sure the sfv files are associated with windows media player because their icons have the windows media player icon. Help?
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said this on 23 Feb 2009 11:16:19 AM PST
Thanks very much!! Your software fixed the PDF extension so that my Windows Mail could open PDF attachments. Another bonus was that it also allowed PDF hyperlinks in Excel to open the linked PDF files! I had spent several hours just yesterday trying to find a solution to that problem.
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said this on 02 Mar 2009 11:56:39 AM PST
All I have to say is: HATS OFF! You solved my problem LITERALLY, in under 60 seconds. Good job!
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said this on 05 Mar 2009 12:36:50 AM PST
This perfect work 100% and This is really a great program. You saved my life! Thank you sooooo much! Keep up future. :)
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said this on 11 Mar 2009 10:32:17 PM PST
Thank you sooooo Much ! :-)))
This was a very small, but yet very very effective tool and i have been looking for something like this in a very very long time. !!
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said this on 14 Mar 2009 2:37:41 AM PST
Praises unto you! Every link opened Skype. Every icon was Skype. I was beside myself!
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said this on 14 Mar 2009 3:23:46 PM PST
Thank you so much works as stated; this little program goes straight into my Vista toolbox.
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said this on 24 Mar 2009 5:25:47 AM PST
I absolutely LOVE you!!!! Thank you so, so, so, so much for writing this program. Your skills helped all of us!!!!!!!!!!!!!!1
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said this on 27 Mar 2009 12:06:21 AM PST
Any chance you can patch this utility so it will work on Windows 7?
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said this on 07 Apr 2009 2:26:33 PM PST
oh! thanks man! i love you! awesome program! im going crazy until i found thisssssssssss! thank you!!! god bless!!
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said this on 07 Apr 2009 9:47:34 PM PST
This program (and you!!) are a genius! Made everything easy, simple and clean. Thank you very much!!!
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said this on 17 Apr 2009 8:13:17 PM PST
Thanks so much!!! This program works like a charm - I had accidentally associated .mydocs with notpad.
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said this on 08 May 2009 1:14:51 PM PST
I am using windows7 and it says it's only compatible with Windows Vista.
I am really hoping that you can also make it work with windows7.
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