download RealMedia Splitter from here
http://www.free-codecs.com/download/...a_Splitter.htm (you can choose with or without installer. if you want to install it manually, below is a link to guide)
http://www.free-codecs.com/guides/Ho...d_AX_files.htm
and if you want to make BSPlayer as default player for RMVB files,go to BSPlayer filetype setting,type RMVB to "add" box and then check that RMVB.