If you have the file's extension associated with an application on the machine, then you can use the Shell function:
Sub YourButton_Click()
Shell "Full path to your MDI file", vbNormalFocus
End Sub
Dev Avish's site has a better process, in my opinion, that allows you a bit more control over the process. The outcome
is the same, but you can trap erros and such a bit easier with it:
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