Hi there, I have a file type that mistakenly got associated with a program and I would like to remove the file from the known file types list entirely. However, when I click on that listing in the File Types tab of Folder Options, the "Delete" button is somehow not active for that one file type. It is active for the others, but not for the one I want to remove. Anyone know how to fix this? (XP Home, SP3) Thanks.