Hi
The vpj file is NOT a video file and YouTube will not recognise it. It is your Videopad project file. It is simply a data file of the list of clips /cuts/effects etc that you used to create your video. When you Save your project or Save your project as, VP creates the vpj file. When you Reload your project, VP uses the vpj file to recreate your video from the clips you have on your PC or in VP cache file.
In order to have a video suitable for upload to YouTube as a separate item, you will need to complete your editing and then EXPORT it to your PC.
Click the Export Video tab
Select a suitable Name/Output folder (e.g.Desktop)
Leave Preset as Custom
File format .mp4
Select suitable YouTube resolution e.g. (1280 x 720) YouTube 720p
Select suitable framerate e.g. 30fps
Select constant framerate.
Under the Encoder Options tab... set the quality level (e.g. about 5.0)
Click OK
These should be about right for starters.
Click Create and wait.
Your video will end up as mpeg4 in your selected output folder.
If it is not to your liking try other values for the Export Preset option. Normally the YouTube preset will output an .flv file.
Nat