Data autofill is stored in the registry in two places:
HKEY_CURRENT_USER \ Software \ Microsoft \ Internet Explorer \ IntelliForms \ Storage1 HKEY_CURRENT_USER \ Software \ Microsoft \ Internet Explorer \ IntelliForms \ Storage2
Direct manipulation is not supported.
Technically, IE7 + API for this:
rundll32.exe inetcpl.cpl, ClearMyTracksByProcess 48
, .