The fundamental DateTimePicker Common Control sets its โstandardโ formats through the bottom 6 bits or so of the GWL-STYLE DWORD of its window. The value for the format stored in the .frm file may well be the whole bit of the DWORD style (WS_TABSTOP, WS_VISIBLE, etc.).
So it may happen that people change other style bit fields, or perhaps even the IDE picks up the difference in default values โโon different machines. For example, some things exist only in later versions of Windows, or perhaps they differ depending on whether the user is active with Luna, Aero, etc.
Using a "standard virtual machine" makes this less likely, but I admit.
Bob77 source share