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A coworker of mine forgot to remove the check from the box "always use the selected program"...he was attempting to read a specific design file that's supposed to be unassociated. Now all files with that extension are associated with Acrobat Reader...lol! I know how to change to a different association by right clicking on the file & choosing "open with"...but how can we change it back to NONE?

HOW TO: Change the Default Action for a File Type in Windows XP
http://support.microsoft.com/default.aspx?scid=kb;en-us;320036

OK, I just checked the link from reponse # 2...it mentions "Click Start, click Control Panel, click Appearance and Themes"...I have no "Appearance and Themes" in my control panel. If I go to Tools>Folder Options>File Types, the ADVANCED button is ghosted out...is this because we're on a network with no Administrator rights?

click start,click run,type in cmd and click ok,
then type
assoc .fileext=
and press enter
this will return the association to none.
(where .fileext is the extension of the file type you want changed to none)
example;
assoc .xlt=
press enter, now .xlt is associated with nothing.

then type
i should've added at the command prompt.
such as c:\assoc .xml=xmlfile
press enter, will set .xml to xmlfile
where as at c:\assoc .xml=
press enter, will set .xml to none.

still no luck...but it seems like we're getting closer...lol. I tried CMD, changed to the proper directory & typed in "assoc .fileext=" (where .fileext= was the .3dh extension)...it says, "file association not found for .3dh"

"file association not found for .3dh"
thats the response you get when the association is set to none.

Although it said "association not found", it has the Adobe Acrobat icon. What's odd is I can change the association to any other program, but I can't reset it to "none". The 3dh file is a CAD file (Bentley Microstation) & is supposed to be loaded thru the program after the prgram is started. For the time being, I associated it with Microstation & it works ok, but that's not the way it should be & all the other PCs in the office show no association for the 3dh file.
KTTD,
I can't do a system restore

jam:
There have been so many posts, I'm not sure the Microsoft link below was given:
Good luck, Solarian

unless something is changing it back, when you type assoc .3dh=
and press enter, from a command prompt
you are setting its association to nothing.
and windows responds
"file association not found for .3dh"
which means it isn't associated, if it were associated with adobe acrobat it would be associated with AcroExch.document
to see all your file associations from a command prompt type
at c:\assoc
and press enter.then you can scroll thru them.
to get the assoc help menu type
assoc /? and press enter.

it's also possible after changing the association, you might have to reboot for it to take effect.

some programs keep the association, even though
you set it, the program resets it. so you have to change it using regedit.
click homepage link for more on file associations, and ftype.ASSOC cannot delete an extension from the registry. However, you can create a similar effect by associating the extension with an empty file type using ASSOC .ext=, without the filetype parameter.
ASSOC should be used with caution, and only after backing up the registry. Improper changes to file associations can prevent applications and / or the operating system from working properly.

Give this a shot. Open the folder options control panel and click the file types tab. Scroll down the list until you find the right extension. Highlight the extension and click the delete button.
If you don't know the extension for the file type click in the view tab in the folder options control panel. Scroll down that list and uncheck "Hide extensions for known file types"
Hope this helps,
Sandman

Unfortunately, all the buttons in FOLDER OPTIONS are ghosted out...I can't use them...it has to be an Admin rights issue. I can change associations by right clicking & selecting "Open With/Choose from List" but there's no option there for "none"

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