Taking from GasMan's example, Here is what the code should look like when you run it from a single database.
Sub TestSubInAnotherDB()
Dim appAccess As Access.Application
Dim strFileName As String
Dim strDBFolder As String
strDBFolder = "c:\test\db\" 'change the path...
This may be of assistance:
Windows batch script - How to filter files with defined extension
https://stackoverflow.com/questions/17638648/windows-batch-script-how-to-filter-files-with-defined-extension
Can you post the code used to update the combo boxes please? It would help us find the error. Also, please verify the names of the combo boxes; it looks like you may have copied and pasted them so they may all be named the same thing causing this to happen (just a blind guess)
try something like this:
Dim varResponse As Variant
varResponse = MsgBox("Have you updated the link yet?", vbYesNo, "My Title here")
If varResponse = vbYes Then
'run macros
Else
Exit Sub
End If
Edit:
Beaten to the finish line