How can I run CHM help file using VBA inside ArcMap environment

Discussion created by eng.a.c. on Sep 20, 2011
I have developed ArcObjects VAB form, inside ArcMap, and I added help button. Also I created CHM help file for my new form but need to know how I can call this chm using VBA code.
I tried to use next code but there is an error

Private Sub helpBtn_Click()
Shell ("F:\proj\help.chm"), vbNormalFocus
End Sub