How to clear entries from "Open with" menu

When you right click on a file you get an Open With menu option,which provides a list of programs for you to open the file with.This list changes along with the type of file you're clicking. This list can get long,and there may be those programs which are not applicable to open with those at all.

Resolution:-To clear those unwanted entries do the following:-
Start>Run>Regedit>Ok

Now navigate to the following location:-
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts. Look for the file extension whose Open With list you want to edit and find its OpenWithList subkey-HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.x\OpenWithList
[.x=any .file extn;eg.bmp]
The subkey will have an alphabetical list of String values.Delete the entry which you don't want.