Lost VBA password for addin.

Some time ago I created a series of Excel addins with xla extensions.  They were all password protected, each with a different password depending on it's ciculation.  It's been about two years since I've looked at the files, and now I don't remember some of the password. 

I tried one of the tips on the forum, and swaped out several line of code from a file with a known password to the old file, but it's still not working.  Instead I get a message that the file is write protected, can't be saved under the old name.  When I save it under a new name then click on it it still tells me the file is write protected.  Can anyone help?