You have the possibility to write your own input Plug-Ins. Therefore you should read the specification. The C++ source code of the Wave Plug-In is available for download. Whoever provides a working Plug-In for a new filetype will get WinCD for free.
You'll find here soon the specification an the source code of in-wave.dll
For more information you should contact me via e-mail to webmaster@wincd.de.