Please see here for types of blogs allowed and not allowed and advertising restrictions.
Note: Aside from a blog being accepted into WordAds, no blogger initiated advertising, retailing or reselling the work or products created or services provided by anyone other than yourself is allowed on free hosted wordpress.com blogs. E-commerce transactions via shopping carts and the like cannot be conducted on free blogs from and being free hosted by wordpress.com
Hummmmm… I’m not intending to make any advertising or to resell someone else’s work… I just want to share freely my works on the calculators for people who need it :)
I read that this formats aren’t allowed on the basic version of WordPress. However, the list you just gave me says : “no upgrade required”. Does that mean that upgrading my account allows me to upload other files types than the ones listed?