It work

loTest = NewObject("MyClassName", "MyVCXName.VCX", "MyExecutableName.EXE")

But it don't work

loTest = NewObject("MyClassName", "MyPRGName.PRG", "MyExecutableName.EXE")

If I have a class in a program(.EXE) and I want to use this class of an another I can use it with the NewObject() function. But if the class are stored in a .PRG file it don't work and display an error message.

In the .PRG file I have

Define class MyClassName as Custom
...
EndDefine

The help file say:

NEWOBJECT(cClassName, cModule, cInApplication)

cModule
Specifies a .vcx file or Visual FoxPro program (.prg, .fxp, .mpr, .app, .exe, and so on) containing the class or object specified with cClassName. The default is a .vcx file. If you specify a program file, you must include an extension.