How can I best convert .vpj project files to .mp3?
Converting VideoPad Video Editor Project Files directly to MP3 Audio Files (.vpj to .mp3 conversion) is not possible; at least not without a simple workaround.
The VideoPad Video Editor allows users to export their VPJ projects in numerous video formats, like for instance MP4. Your best bet is, therefore, to first export your VPJ project in MP4 format. You can then easily convert MP4 to MP3.
A video editing software for Windows