How to burn a DVD from RealMovie format

hi,

I’ve downloaded a movie from the internet. Its downloaded in 2 parts in realvideo/real audio format, consisting of 53 mb each file. I’ve got a Sonic DVD(5.1 ver) Software installed with the DVD RW on my system. When I try to burn the movie using the Sonic Software, i’m getting this message:
“One or more files Couldnt be imported: MyDVD does not support this file type. Check the user guide for details on supported files.”

I checked the supported files list and these are supported: AVI,QuickTime,WMV,MPEG-1,MPEG-2.

Now how can I convert these into the DVD and burn them? Please give me step by step advice. Any help would be greatly appreciated.

SAI