Hi mcmanusj67,
When you save a MixPad project you will get two important things:
1. A project file called mysong.mpdp
2. A project data folder called mysong.mpdp.ProjectData
These two items must reside in the same directory. If you move the project file then you must also move the project data folder.
Can you have a look and see if that folder exists on your desktop?
If not, check your Recycle Bin to see if it has been accidentally deleted.
In general, I would caution against using your desktop to store your MixPad projects. It is too easy for desktop items to be accidentally cleared away or moved.
Let me know if you still can't find it and I'll see if I can help you further.
Regards,
Ben