CSV (comma separated values), that can be read from excel (and other flavors) without problems. You can easily generate them and if need them read back with procs like oacs_util::csv_foreach
Try to save and excel sheet as CSV and them open it in notepad or something to get the idea.
you can send your data (I don't know about attachment but the data itlsef with procs like acs_mail_lite::send
For printer friendly what you want the is the content without any format, so leave the adp without <master> stuff and things like that.
