PCM 22.050 kHz, 16 Bit stereo.
If you still have your XP disk somewhere, copy sndrec32.exe from the XP system32 folder to your W7 system32 folder, and set it to XP SP3 compatibility mode. It should run perfectly well, and has more functions than the W7 rubbish. One of those functions is that you can easily set the frequency and rate of wav files... Audacity and Wavosaur, another editor, canboth be a pain for little things like this.
If you haven't got sndrec32.exe, give me a yell.