>>>- The resulting application file (import.app) has the correct date, but the time is approx. 12 minutes behind the clock (12:56) . It doesn't matter whether the clock is correct or not, the stamp is behind

Just to be absolutely sure use the Windows "find" to look for any other copies of the file.

>Windows explorer says 1:03 ( should be 1:15 )
>DOS says 1:02 ( still should be 1:15 )
>I didn't expect a difference between DOS and Windows... What up with that?

Don't know. Maybe one truncates and the other rounds.