You're Welcome. The player is extremely limited. I never found a way to skip ahead or rewind during playback. You just press play and gotta rewatch the whole damn thing. But!! To pause/unpause you hit ESCAPE.
You will need whatever ROM was used when you generated the recordings. Technically ".krec" files aren't video files, they are just timestamps of all the button presses that occurred. These get sewn together with the ROM to re-enact the games. This makes for super-small krec. files, since so little data needs to be saved.