I accidentally allowed Windows to open a file myfile.213 using WinZip, and since I did not uncheck the "Always use this program to open these files" box, now it ALWAYS wants to open files with a .213 extension with winzip, and shows a winzip icon next to the myfile.123 file name in a folder window. When I click on Tools...Folder Options...File Types to remove this association, there is no listing for files of type .213, so I cannot remove this association. I also looked in the registry under HKEY_CLASSES_ROOT, and there is no entry for files of type .213 there either. I don't want an automatic open of files with that extension to happen, and I want the icon for .213 files to go back to being the default instead of the winzip logo.
How do I accomplish this?