Your example works fine for me in IE10 on Windows 8.
You should be aware that:
- you should only need Ogg Vorbis and AAC (.m4a) to cover all browsers. The .wav and .mp3 won't help.
- some formats have complicated sub-formats, like .wav files can contain MP3 audio, .m4a files can contain certain sample rates or bit depths that a particular system might not support, and .ogg files could contain video or other content. Most browsers don't support all sub-formats, so you should carefully check the exact sub-formats of every sound you use and make sure they're supported. 16-bit 44.1KHz mono/stereo is almost always supported, so try not to deviate from that.