Extracting Value From External File

I have been trying something like this before, i could not get it fixed. Let's give it another go:

I have a number of files in a specific folder. I need to extract values from cell Sheet1!G42 out of [b]every file[b] in this folder. Problem that occurs, is that I do not know how many files are in this folder, neighter do I know what the filenames are. I need some magic to perform extraction of the desired values.

As for the files in the specified folder I have this VBA code, that suits my needs just fine:

Private Sub Workbook_Open()
Dim fileList() As String
Dim fName As String
Dim fPath As String
Dim I As Integer

This code will display all found files, including their path in column AD. (as plain text)
[b]Question that remains:[b] how am I to fix a formula In (column AE) that will extract the value found in Sheet1!G42 of each file? This must be very easy, but i can’t get this to work….