Triiger 'RunCode' data macro in ms access?

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MS-Access

VBA

trigger

hey guys,
i am new to data macro in ms access 2013 and need some help with it.
so lets assume that i have a simple database with only one table of Users.
when i change the "Age" Field in the table, i want to run an external exe file (the reason why dosent matter).
so i learn the subject during the last few days and end up with this:
1. i build a module in ms access called RunMiniFix (MiniFix is the name of the exe file i want to run). the module uses ShellExecute function and the whole module looks like that:

Option Compare Database
Const SW_SHOW = 1
Const SW_SHOWMAXIMIZED = 3

Public Declare Function ShellExecute Lib "Shell32.dll" Alias "ShellExecuteA" _
  (ByVal hwnd As Long, _
   ByVal lpOperation As String, _
   ByVal lpFile As String, _
   ByVal lpParameters As String, _
   ByVal lpDirectory As String, _
   Optional ByVal nShowCmd As Long) As Long

Public Function RunMiniFix()
  Dim RetVal As Long
  On Error Resume Next
  RetVal = ShellExecute(0, "open", "C:\Program Files\MiniFix\MiniFix.exe", "<arguments>", _
                        "<run in folder>", SW_SHOWMAXIMIZED)
End Function

Now, when activating the module, everything works just fine and the exe file is running.

2. in ms access, i build a data macro base on an If Then statement, asking
if [Users]![Age] > x and then calls the RunCode event from the action catalog which calls the RunMiniFix function.
Now, when saving the data macro, the ms access pops up a message box saying Microsoft access dosen't have the ability to find the name "Users" i mentioned in the phrase and recommend me to look for the right control in the form. "the form"? yes, the form!
this database is not form based. i have no gui designed what so ever. i have no buttons or click event to handle.
what i am asking is how can i trigger the RunMiniFix module when the Age field is modify. please, this is very important!
thanks a head,
oron.