Getting lastmodified date of file on Sharepoint server

In Access 2016/2010 I use the VBA code below to get last modified date of a file - and it works fine, excep when it comes to mdb files on a Sharepoint server - all other file extensions are fine, but not when it comes to mdb files - anyone know a reason and a workaround for this ? Same scenario if I use the built-in  FileDateTime function.

Maybe a built-in feature of /%¤/%¤ Sharepoint, as I see a lot of similar questions, but no solutions:
example

Function GetDateModified(strPath As String) As String
    Dim fso As Scripting.FileSystemObject
    Dim file As Scripting.file

    Set fso = New Scripting.FileSystemObject
    Set file = fso.GetFile(strPath)
    GetDateModified = file.DateLastModified
    Set fso = Nothing
    Set file = Nothing
End Function

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