>I am running a report
>
>cAlias = "tmp"
>cRptName = "forecast"
>
>LOCAL loReport AS "PreviewHelper" OF "FoxyPreviewer.App"
>loReport = CREATEOBJECT("PreviewHelper")
>loReport.AddReport(cRptName, "to printer prompt preview noconsole", cAlias)
>loReport.RunReport()
>
>
>this report is run in a form whose
>DataSession = 2
>ShowWindow= 1
>
>Everything is fine except that when i close the form the files were opened in forms private datasession are still there with the name Unknown(2).
>Why the files are not closed in this data session even the datasession is set to private in form?

Have you isolated the problem to be previewer? In other words, if you comment out this code, you don't have the same problem? Also, just in case, have you tried adding loReport = null
release loReport

after you finished?