[Zope] content getting a new line appended.

We've got an application that sends down an audio file to the user. It does this from an external method, that essentially does something like: RESPONSE['content-type'] = "audio/x-wav" out = fp.read() # fp is filehandle of data. return out Somewhere between Zope 1.10 and Zope 2.1, something changed such that the content is getting a newline appended to it. This is breaking certain audio players (for unknown reasons - I'd have thought that they'd ignore it... but anyway). Is anyone aware of anything like this that might have changed? Pointers on where to look? ta, Anthony