Open video Convert can become your solution for this kind of works, because it supports MPEG, WMV, ASF, MPG, OGM, DAT, SVCD... and convert them into AVI, so you can play them.
The only thing you have to do is to choose the video you want to convert into AVI format, determine the conversion parameters and choose the output folder.
Open Video Converter allows you to configure the kind of AVI conversion you want to perform, choose the codecs you want to use and specify some advanced options.
In addition it lets you convert only a part of the video if you don’t want to convert the full video.
The trial version only converts one minute of the video