[Mark Stuffman]

Fraps is most likely storing the files using a codec that Premiere does not support (e.g. xvid). You can use gspot (https://gspot.headbands.com/) to see what codec is being used.

If it is xvid, you need to convert it to something that Premiere will read. You can convert it to an mpeg1 files, using something like fxmpeg (https://fxmpegwriter.com/)