Tools > Options > File types
Set the associations how you want them. Try an Internet search to read about "file associations".
Jim, went into tools, options, and deselected all video and image formats. Tiff was yes before I changed it which most likely explains why my Tiff images were hijacked. I won't happen again but they still remain on the computer as JRiver files. Have to work within windows now to change them to? don't know what but I'll find out on another forum.
thanks