I'm afraid that's possible
I'm afraid that's impossible - much as with other paid e-books, the dictionaries we sell are copy-protected and we're not allowed to release them to users in plaintext format.
Unfortunately that's not possible at the moment. (we're not aware of any technical solution for that, and even if one existed, some of the licenses we've signed with publishers don't necessarily contemplate us distributing dictionaries that way and would have to be renegotiated to allow for it)
Could you give me a hint what kind of files the .pdb dictionary files are?
Do you have an idea where I could obtain a good quality dictionary like the ABC in a format that I can use to make a dictionary?