i suggest you make sure you have no other audio programs loaded (i.e Windows Media Player). while Windows XP can manage more than one sound playing at once it's sometimes not as effective as it could, perhaps, be.
do you get any error message at all? it may also be a good idea to check that the sound file is named correctly (123.mp3 in your example). I am unsure as to whether or not Audiator supports .wav or .wma (probably not .wma) files.
Hope this helps, if not just reply to this post and we'll see if we can sort out your problem
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