I couldn't remember that Aaro made one, also because I don't use Paint.Net,
here's the topic. You showed a message box about save in TEX format, so, you implemented it, Aaro.
Anyway, come on... How can you really believe that the file is a virus? The file made by the same person who linked it to you? Don't you trust him? The message just says that it
can harm your computer (nothing tagged it as virus...), just because it's not a so known file, and then it's a message of Chrome browser, it isn't neither of your antivirus, assuming that you're using one... I find your behavior pretty impolite towards Aaro...