@MattX A byte is 8 bits, a kilobyte is 1024 bytes. That's why I try to use the suffix with a "i" for the computer sizes such as kib, mib etc. Local $iMailqueSize = FileGetSize('C:\Program Files\Microsoft\Exchange Server\TransportRoles\data\Queue\mail.que')
If $iMailqueSize > 1024 * 1024 * 1024 * 20 Then ;1 kilo -> 1 mega -> 1 giga * 20 = 20 Gio
;1 * 1024 * 1024 * 1024 * 20 ; 1 byte -> 1 kilo etc.
Run('c:\matt\mail_que_email_alert.exe', 'c:\matt')
EndIfEdit: You understood that the size unity step is *1024. Br, FireFox.