Command Prompt through Excel

Good Morning

I am trying to run a command through excel, I managed the command shell to open and access the correct directory but don't know how to add the .exe file it should run with param. Code I have is-

Private Sub CommandButton4_Click()

Shell "cmd.exe /k cd C:\Program Files (x86)\A App Folder", vbNormalFocus

End Sub

I need to add

app.exe /A C:\Test\1100.pdf

Thanks