Use the ShellExecute() API and it will launch any file with it's associated application, i.e.
In a Standard Module:
VB Code:
Option Explicit
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
Public Sub OpenFile(ByVal sFile As String)
ShellExecute 0, "OPEN", sFile, "", "", 1
End Sub
Example Usage:
VB Code:
Option Explicit
Private Sub Command1_Click()
OpenFile "C:\SomeFile.pdf"
End Sub