Puoi provare l'api shell execute per aprire il file.
http://www.mentalis.org/apilist/ShellExecute.shtml
Esempio:
codice:
Private Declare Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" (ByVal hwnd As Long, ByVal lpOperation As String, ByVal lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As String, ByVal nShowCmd As Long) As Long
Const SW_SHOWNORMAL = 1
Private Sub Form_Load()
'KPD-Team 1998
'URL: http://www.allapi.net/
'E-Mail: KPDTeam@Allapi.net
'Send an E-Mail to the KPD-Team
ShellExecute Me.hwnd, vbNullString, "mailto:KPDTeam@Allapi.net", vbNullString, "C:\", SW_SHOWNORMAL
End Sub
Sul dblclick del picturebox punti a file:///percorso/file e dovrebbe aprirtelo col brower di sistema (es. ie o firefox o opera o quello che hai impostato).
Scusa ma alle 3 di notte non sono molto logorroico :P