- for office 2003 here the solution:
- Start -> Run -> regedt32.exe
and so on
- right mouse click -> new -> String Value
- Name: BrowserFlags
- Value: 8
Works for all extensions (doc, xls, pdf (!) and so on)
For somebody who would like to try this, be very, very carefully and baxkup your registry before changing !!!!!!!! It may kill your pc in seconds ...