I am confused. A Google search says wave files are wav files which is an audio format. If the file type you are referring to is associate with Quicken then contact the Quicken people. They need to write an app for that.
Alot of his emails have wave files that use quicken,
Perhaps you mean files that use Quicktime?
In any case, the supported formats for email attachments have been listed in the tech specs since Jan. 27. No can tell you if or when those are going to change.
If it is not there, best to switch to a laptop/netbook.
You can ask Apple for more here: