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When you double-click OpenWithClear.exe, a GUI open that allows you to select a file extension from the Extensions drop-down box. When you do, the Dynamically assigned programs box will contain the dynamic entries in the Open With list.

The author, Doug Knox, provides a Clear button, to allow you to select one or moreĀ  programs to remove, and a Clear All button to remove all dynamically assigned entries.

NOTE: This program should work on any Windows operating system if the VB 6 runtime library, which is included in Windows XP, is installed.