When you use the Open With context menu, Windows 2000 records
the program used to open the file extension.  If you
accidentally opened a file with the wrong program, you can
remove the entry:  1. Use Regedt32 to navigate to HKEY_CURRENT_U
SER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
<.extention>\OpenWithList.  2. Each entry uses a value name that
is a letter, as in a, and a data string which is the program
that opened the file, like Notepad.exe. Locate the program that
you wish to delete and record the value name. Delete this value
name.  3. Edit the MRUList value name and remove the letter that
you deleted.