Blender 2.49b: Loop animation between selected markers

My question refers to an example .blend file supplied with the Mount and Blade: Warband trf exporter. In it, one can find the following Action Editor set-up:

Note the WalkLoop1Start and WalkLoop1End pose markers; When I play the animation from the beginning, the full 150 frames are played, following which the animation jumps to WalkLoop1Start and loops between those two pose markers indefinitely.

I would like to have a similar set-up, but I have been unable to find the right buttons to do such a thing. Looking at the example does not help, as creating the pose markers is not the issue; Telling the animator to loop between them, is.

Please note that I am NOT talking about the NLA Editor cyclic extrapolation functionality; this .blend file uses none.

• To be honest, I have no idea. I'm not sure if you realize, but 2.49 is so old many of us have completely forgotten any version specific issues. It was released around 8 years ago. If at all possible, I'd very strongly recommend using a newer version. If for some reason you can not, do not be discouraged or upset if you don't get an answer. – VRM Jun 3 '17 at 23:37
• Why are you using 2.49? The interface and animation settings changed a lot after version 2.49. If your goal is to learn blender I would suggest you start with the current version. Getting support for that particular version might be difficult, or what you learn from this project might not apply to current versions. – user1853 Jun 4 '17 at 2:11
• The export script I use only works in 2.49b, although this isn't really an excuse as I suppose I could just as well do the animation in 2.7x, and load in to the old version exclusively for exporting (I think I can, at least). At this stage I'm simply driven by frustration that I cannot replicate such seemingly simple functionality. – Maxim Blinov Jun 4 '17 at 2:44