Grab BIS's commented config files from the Breath site, or from here on ofpec. Locate the file named "cfgMoves.hpp" and open it up. Inside of it, all the default animations are configured. Just do a search for the classname of the animation you want (eg: "class crouch"), and it will bring you to the config for that animation. Then just find the line that says "file=blah.rtm", and it will tell you the name of the .rtm file used in that class.