Question : trouble 'converting an encoded database'

I have a MS database that I cannot attach due to the proprietary nature of it's contents.  I get a message when opening a 2003 format Access mdb database file with Access 2007.  It says...  "You are trying to convert an encoded database.  Decode the database, and then try again."  After clicking the encode/decode button and saving the new file, I get the same message again.

Answer : trouble 'converting an encoded database'

I've never attempted what you are doing, so that qualifies what I'm saying here.

I suspect that you will have to decrypt it in A2003.
A2007 uses a completely different algorithm for encryption so I'm guessing it won't do anything with an encrypted A2003 database.  

But see if anyone else says anything different.