>Do you mean I don't need that DLL or that I don't need to register it?

Don't need to register.

>As for the error, it's on line 7 on the SaveAs() method. Could it be that I cannot pass a full path as a parameter?

You can pass a full path. Do you have a write permission to that folder?
The code in SaveAsJPEG is very clear:

Procedure SaveAsJPEG(tcFileName, tnQuality, tnTransform)
	If Vartype(tcFileName) != 'C'
		Error 11
	EndIf
	If !Empty(tnQuality) and (Vartype(tnQuality) != 'N')
		Error 11
	EndIf
	If !Empty(tnTransform) and (Vartype(tnTransform) != 'N')
		Error 11
	EndIf