Unassociate file extension in Windows XP

There is an Oracle backup file with extension .DMP. Accidentally I set the file association to Microsoft Excel. Now I want to un-associate this. I don't want it to be associated with any program. I simply want that when I double-click the .DMP file, it should open a "Select Program" dialog.

How to un-associate the file extension in Windows XP?
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rpkhareAsked:
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mrroonieCommented:
i'm not sure you can completely 'unassociate' it but you can change what opens it - Open windows explorer or My Computer, go to Tools menu and then choose folder options. The 2nd tab along is file types. scroll down to .dmp and click 'change'. associate it with the program you'd like to use to open it
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TCC_HDCommented:
You could just delete the file association.  Open up Explorer.exe and got to Tools>Folder Options then click on the file types tab.  When you find your .dmp file association, highlight it and click delete.  Without the proper file association windows will not know how to open the file and will prompt you to select the appropriate program to open it with.

-TCC
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orangutangCommented:
You can also delete ".dmp" from the HKEY_CLASSES_ROOT key in regedit.
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jcimarronCommented:
rpkhare--Perhaps the simplest.  Right click any .dmp file|Open With|Choose Program.  Highlight the program you want to open .dmp with and check the box "Always use the selected program...|OK
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rpkhareAuthor Commented:
jcimarron,

I want to un-associate the file from the program. You are suggesting to associate a file with a program.
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rpkhareAuthor Commented:
Thanks
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jcimarronCommented:
rpkhare--"Now I want to un-associate this. I don't want it to be associated with any program. I simply want that when I double-click the .DMP file, it should open a "Select Program" dialog."
"I want to un-associate the file from the program. You are suggesting to associate a file with a program."
What are you going to do when you see the "Select Program" dialog??
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rpkhareAuthor Commented:
Ya, what I meant was that when we click on a file that has no association, a "Select Program" dialog is open. I want to bring the associated file to its original un-associated format.

Probably I used confusing words in my original post.
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