MAPI support

I have modified my registry setting for the Mapi DLLPath in the regitry to point to dirve:portablethuynderbird\app\thunderbird\mozmapi32.dll but it does not start a mail witht he attachment. It does not even start thunderbird. Any way to get the mozmapi32.dll to work portably. I know fairly little in regard to the code for the dll or how it points to thunderbird or anything. Thank you.