You read the HTML via your browser so I guess it's as safe as your browser is safe. I made the HTML file myself and I use Firefox. If there was something wrong with the file my browser would have alerted me. I don't insert ads or spam into the single file html websites I make. If that's what you meant by safe.
RTF is the default format Wordpad on Windows operating system reads. The reason it's so popular is because it's an open format that every word processing program can read.
I'm not sure what operating system you're using but if you can't double click an RTF file and it opens automatically in Open Office, Microsoft Word, Atlantis, or Wordpad. I think there is something wrong with your computer. Not sure what comes with Macs thought...I'm now kind of thinking maybe you're using a Mac computer.
For PDFs to open you actually have to have Adobe Reader installed on your computer or Foxit Reader. There is no built in pdf view on every operating system. (at least not that I've heard of)
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RTF is the default format Wordpad on Windows operating system reads. The reason it's so popular is because it's an open format that every word processing program can read.
I'm not sure what operating system you're using but if you can't double click an RTF file and it opens automatically in Open Office, Microsoft Word, Atlantis, or Wordpad. I think there is something wrong with your computer. Not sure what comes with Macs thought...I'm now kind of thinking maybe you're using a Mac computer.
For PDFs to open you actually have to have Adobe Reader installed on your computer or Foxit Reader. There is no built in pdf view on every operating system. (at least not that I've heard of)