Hello. Just today i was doing some work on a file for use in a video game. I've done this before, but some of my settings had changed since then. The clip is about 24 seconds long and plays fine in a music player. I realized that the file wouldn't play in game, for some reason.

I decided it was best to use a lifeline and PMed a friend about it. We entered a Steam Chatroom and he explained that the sound had to have the right Khz. I looked at my previous files (The one that works) and it is 44 khz. However, when I select 44100 Hz for Default Sample Rate, it does not export in 44 Khz, but 48 Khz. I know because I checked the file's properties.
Is there a problem with audacity? Is there a way to fix it?
NOTE:
I'm exporting these clips as .wav's AND .MP3's and neither of them are in 44 Khz.