place this declaration in the general area
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
in the click event of the textbox place this code
replacing the txt.text with you text box value
ShellExecute(Me.hwnd, "open", txt.text, "", 0, SW_SHOWNORMAL)
Success!
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