Well, if you;d like to use an external exe file, here is one I made quickly. All it does is emits a 100Khz tone for 1 second. The source is included, for you to review. You can find it at:
http://www.kingtomato.com/mirc/BIOSBEEP.zip Simple put the exe in your mirc folder, and use /run -n BIOSBEEP.EXE
