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There are a couple of things going on here.
First is the file that you're downloading from the library. What you get from them is basically a temporary "ticket" that allows you to then download the encrypted library book from Adobe's servers. This can only be done with ADE. The ticket itself isn't an epub file, so setting Stanza as the file handler for epubs won't make a bit of difference. Also, unless you are decrypting these epub books after downloading (which as far as I know, the tools to do so are only available for Windows), you won't be able to read them in Stanza anyways.
The second issue is how the Mac file handler works. You can have multiple applications set as the default handler for the same file type, unlike on Windows. So unless you actually went into the "Get Info" dialog for an epub and clicked the "Use this application to open all documents like this. Change All." button, you only told the OS to use Stanza as the default for one particular epub file. But again, any epubs that are downloaded from the library will default to using ADE since that's the only program that can properly handle them.
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