If you use PDA to record some sound, the file format you get will be .pwi format. It is not a supported audio format for most media players, or audio converters either. After searching the Internet, I found the following work-around to convert the .pwi format to the mp3 format.
You need two tools before you start:
Here are the steps:
- Open a copy of the .pwi file with PSPad in Hex mode (just in case it does not work).
- Delete everything up to the “RIFF” header (.wav format starts with “RIFF” header).
- Your file should start with “RIFF” now. Save the file and rename it to .wav format.
- Open the .wav file with Audacity and then export it to the .mp3 format.