I installed first the certs.cab and afterwards the sdhc.cab.
Now, I see my SDHC card, but only the 4 GB, not the whole 8 GB.
My other problem is, that I'm not able to replace the two dll files (using active sync) --> reason: the file is in use and can not be replaced.
my device:
FSC T810 with GERMAN WM5 (Smartphone Edition)
8 GB CLASS2 Hama storage card
Copy them to for example the storage card and, then, use the local (!) Resco or File Explorer to copy them to \Windows