Hi Peter
Thank you for your feedback, which helped me to solve the problem.
I'm using Windows 2000 and there are two settings for the regional options, one for the current user and one for system. Both of them were set to German (Switzerland). This locale defines '.' as the decimal symbol but I've still got ',' in my db results, so this seems to be a bug. After having changed the system locale to English (United States) I now get '.' again as desired.
Thank you again for your valuable help.
Greg, Switzerland