In Vista with the latest Firefox update, You might have noticed a problem when opening URLs in applications like Outlook or even the Windows Sidebar. you will get a popup like this below

If you want to fix this error follow this procedure
Go to start>run type regedit click ok
Now you need to navigate the following key from left pane
HKEY_CLASSES_ROOT\FirefoxURL\shell\open\ddeexec
Now you need to Double click on the Default REG_SZ registry value from right hand side, which should have a value of “”%1″,,0,0,,,,”. Delete that value and leave it blank.
Close and exit registry editor
Now you should be able to open links from outlook in firefox without any problem.
For Windows XP and Windows 2000 User
Open Windows Explorer (or My Computer).
Go to Tools -> Folder Options -> File Types
Select Extension: “(NONE)” File Type: “URL:HyperText Transfer Protocol”
Click “Advanced”. In the “Edit File Type” window, select “open” and click “Edit”
Uncheck “Use DDE” (the dialog should then hide the lower part).
Click OK for that dialog and the next one (afterwards, the “Use DDE” box is still checked but the “DDE Message” box will be cleared)
Repeat for Extension: “(NONE)” File Type: “URL:HyperText Transfer Protocol with Privacy” (and any other protocols you want to fix)
Repeat for Extension: “(NONE)” File Type: “Firefox URL”
Repeat for Extension: “HTM” (or “HTML”) File Type: “Firefox Document”
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It worked
1st one that has in Vista
well done
Hmmm… I’m having multiple problems with Firefox with the latest update, and cannot get it to run at all. Have unistalled and reinstalled multiple times. I have the same URL general failure happening now with IE, and this fix didn’t help (not surprisingly). Any idea how to fix IE?
Can anyone help.When opening an email if I click on the web address of a company etc, outlook wont go there unless I have Internet explorer already open, its giving my the irrates. Hope someone can help
@sue
You need to make sure if you are using IE as your default web browser.Which OS you are using XP or vista
or try this
Open Windows Explorer> Tools> Folder Options> File Types tab. Highlight URL:HyperText Transfer Protocol click Advanced button then Edit button. Under Application used to perform action it should read:
“C:\Program Files\Internet Explorer\iexplore.exe” -nohome
Hope this helps
Works on my Vista Home Basic, Outlook 2007, Firefox 2.0.0.14
Thanks
I’m unable to open certain e:mails with attachments, it continues to say no url found. Can you help me.
fix error windows mobile iexplore.exe 5.2.0.0
Can anyone help my problem because I couldn’t open the Cpanel of my site… always windows prompt:
Not Found
The requested URL /Cpanel was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Apache/2.2.11 (Unix) mod_ssl/2.2.11 OpenSSL/0.9.8i DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at lpablo.usm-cencom.net Port 80
Worked! Thanks.
I recently installed Windows 7 and was having the described problem of not being able to open links in firefox from outlook. I followed the directions above…
Go to start>run type regedit click ok
Now you need to navigate the following key from left pane
HKEY_CLASSES_ROOT\FirefoxURL\shell\open\ddeexec
Now you need to Double click on the Default REG_SZ registry value from right hand side, which should have a value of “”%1?,,0,0,,,,”. Delete that value and leave it blank.
Close and exit registry editor
…and now I no longer get the error message when I click a link from an e-mail but nothing else happens either. Is there another step or something else I need to do?
Thanks in advance.
i need to set my http protocol in windows 7 and i cant seem to find a fix
Thanks admin it worked !!!
For Windows XP and Windows 2000 User worked like a charm!
Thanks heaps!
Send Me How to Fix Windows Error .