I created a Spanish-English dictionary based on the StarDict files.
http://www.4shared.com/file/Ux4eAqzc...h-english.html
Thanks a ton for all the help, it worked after I figured following out:
Copy the StarDict-Editor to
C:\Program Files\Common Files\GTK\2.0\bin
(or similar, where the .dll are).
Before creating the .mobi file with the mibogen.exe, make sure that you change the input language.