The eBook readers don't have a Save As function. To convert these .lit
files to a less proprietary format such as .txt, you have to use the
unfortunately named c-lit converter, which runs under Windows or in VPC
if you have that on your Mac. You can download it at
http://www.kyz.uklinux.net/convlit.php
and many other places. I don't know of any easy way to do this on the
Mac side, although there is unix source code which you can download from
the same site, presumably compile, and run in Terminal. I don't know how
to do that myself however; i'd need a pre-compiled binary.
You understand, this is a hack and may violate DRM restrictions. There
is the legal argument that if you properly purchased a .lit file, you
have the right to use it in any way you want. It's not a high-frequency
scenario, however, to purchase an eBook in a format for which you don't
own a player...
George