Error 2147024893 calling DESKTOPTODEVICE

Hi all,
I have the error -2147024893 calling the function DESKTOPTODEVICE of
adofiltr.dll from desktop application.

I am using Activesync 4.1 (and wm 2005 on pda).
The same application works fine using Activesync 3.8 (and wm 2003 on pda).

Any ideas ?

Thanks in advance

OK.
I fix the problem:
In desktop application I loaded adofiltr.dll of activesync 3.8 while running Actyvesync 4.1.