Oops!
mpusbapi.dll was not in folder bin\Release (where my output application goes).
Copied it in there, as Mat said, and now it is working.
The SW is always right, no?
Rec
When I build PicUSB in Visual C# 2005 Express, then run it, I get an exception:
"Unable to load DLL 'mpusbapi.dll': The specified module could not be found. "
It seems to me that I read something ab ...