Presets (.prpfset) can be certainly created in Adobe Premiere Pro, but it is unlikely this is done with some kind of file conversion like jfif to prfpset conversion (from JFIF/JPEG source). With that said, you can work with JPEG/JFIF images in the program, but it for other purposes.
This conversion entry was verified by us and conversion was flagged as wrong or not possible.
Usually this happens when the conversion would try to convert different types of data between each other, such as audio to image, or it is not possible because incompatibility between programs, caused by closed file formats, very limited support etc.
If you find entry that you feel is flagged as bad wrongly, please tell us in the discussion below with as much as information as possible so we can fix it.