Hey, thanks for the feedback! Here's a few answers to some of your questions:
-so what are the exact system requirements of c2 ?
The only system requirement should be Windows XP SP2 or newer. I guess you got the error on a Windows XP SP1 machine. Perhaps you could check that and let me know? C2 uses several features only introduced in XP SP2 so it would be extremely difficult to support XP SP1 or earlier.
tml5 performance isnt optimal.
Firefox 6 (the latest), IE9 (the latest) and Chrome 14 (next one out in ~6 weeks) all have hardware accelerated rendering - so you should get very good performance with them. However, if you have an old graphics card or out of date drivers, the browser may fall back to software rendering which is slow. Make sure you have the latest graphics card drivers! In 6-12 months or so I imagine the majority of Internet users will be using a hardware accelerated browser.
can you give some information what you expect to be last date of the first version of the .exe exporter somehow ?
We honestly don't know what to say - we're stretched to the limit with finishing features in the editor and HTML5 exporter. Once that's done it will take more time to get an EXE exporter done if that's what we decide to do next. So I don't want to say anything in case anybody holds us to that!
so can you please give some estimation on how the opengl exe exporter would run compared to cc on older hardware (for example p3 1ghz, gf1 or 2, athlon 1200 radeon 7k, 8k)
would there be any fps loss to cc games or to other opengl games that run good on such hardware (e.g. idtech3, cs, or with dx ut2003) ?
An OpenGL runtime should be equally as fast as the DirectX one (it's the graphics hardware that sets performance, not the API). OpenGL is much more compatible than DirectX though. You won't need any updates at all, for example. Most computers can run OpenGL without any modification at all.
what would be the estimated system requirements (opengl version, drivers, os ...) ?
Same as C2: Windows XP SP2+ (don't know about Mac, haven't looked yet), and OpenGL 1.1 which has been pretty much universal since 1997.
how secure is my gamecontent exactly ?
r51 obfuscates javascript so it should be nearly impossible to reverse engineer a HTML5 game on the web back to its C2 project. However, due to the nature of the web, your images all have to be uploaded to the server too. Copyright law is on your side though: in most countries, you do not need to do anything to copyright your work, it is automatically copyrighted to you, so it is illegal for anyone to copy and use your images.
Hope that helps - let me know if you have any more questions!