Importing cvs file

I am trying to import a csv file under  Newsletter Subscribers with no luck. I have tried a plain excell file and a csv file. I get an error that says 'wrong file format'.. Any suggestions?

You can do an Export first to see file format.  If you don't have any subscribers yet, do it on admin demo

Format is very simple:

Email-address, Boolean

e.g.

[email protected],True

I actually figured out that when you save a file from there it saves a .txt file, so I tried uploading a .txt file and PRESTO! It worked... Coolness!