I,m using the next Dlls and they must be registered

Craxdrt.Dll
crtslv.dll
crviewer.dll
ExportModeller.dll

Also

crxf_pdf.dll
u2dapp.dll
u2ddisk.dll
u2dmapi.dll
u2fwordw.dll
u2fxls.dll

Those dlls should by located on Window\system32

they are using for exporting