Hi, hope someone here can help me with this issue!

I have a custom.dic (Contains a heap of geological terms) that i saved off a website (the list is designed to be used as a custom dictionary). I opened it in Mozilla and clicked file save, so it is a html file type. Now i can open the file in microsoft word (2007) and save it as a word document. however if i then try to add the file as a custom dictionary i get the following 'files without unicode encoding can't be added to the dictionary list. Save the file as a unicode file to add it to the list'

Does anyone know how i can do this or if it is even possible.
Help is very much appreciated!

Markus