If the MS-IExplorer will get an pdf-file the browser prompmts Datei beginnt nicht mit "%PDF-" after ok. and actualise opens the acrobate. The thame pages published with w2k and MS-presentation manager works very well.Also with mozilla no problems.
This is a known explorer bug/race condition. Try setting downgrade-1.0 and force-response-1.0 variables for MSIE.
*** This bug has been marked as a duplicate of 25960 ***