|Well, I tried a file renamer and did not find any tags or extensions including the '5dfly'. I tried renaming a file just to test; didn't help.|
So I went looking for a catalog of file types, and found what I was looking for in the registry at HKEY_CLASSES_ROOT, where it turns out that my jpg and jpeg file types have "5dfly.jpg" in the data column of name/type/data. So I've been asking myself if this bugs me enough to mess with my registry, and the answer is yes. So here goes.
I use several graphics programs, and 5dfly is the first I've ever seen insist on branding my file types. At worst they wanted to change file associations, and asked nicely first.
Thanks for the help and responses; much appreciated.