Hey pippepin, can you elaborate on what you're doing there? It looks like you're using the primary fire on the gravity gun on that sign. I just want to clarify because I couldn't seem to reproduce it when I tried. Does it need to be that sign? Also, does that only work that map? Or can that be done in the single player game as well?
Frosstbyte, use
Winrar to first open the file, then extract out the movie.