How to play .VOB, .IFO, .BUP file on the DivX Player installed on HTC HD2.

I need to convert .VOB, .IFO, .BUP files to be able to play them with DivX Player on my HTC HD2. Please do let me know how i can convert them. I was able to install the player with two sample videos. However, whenever i click any of above format files from the file explorer in windows mobile 6.5, it gives me a message e.g.

"There is no application associated with VTS_01_1.VOB Run the application first, then open this file from within the application."

But when i go to the player, i am not able to find out the way to select a file to open. Besides, the buttons are too small. Please do let me know how i can use it. Please do share the path of the right player maybe i installed some wrong application.

Thanks,