Hi George,
I saw your code:
SET CLASSLIB TO SDIClass ADDITIVE
oPreviewfrm = CREATOBJECT("PreviewForm")
RELEASE CLASSLIB SDIClass
REPORT FORM (report file) NOCONSOLE PREVIEW WINDOW (oPreviewFrm.Name)

I Have problem in finding the SDIClass: have I to build it? And in this case how?
I'm working on VFP 5.0, and with the SCREEN=OFF in the config.fpw I cannot display the preview:
you say because the default is in _SCREEN.... okay, can you help me?