Now we know that Netbeans 6.8 does install, we still can't do a thing with it because the modules are not loaded. To do that you have to go to drive\netbeans\bin and run netbeans.cmd. But this file is from version 4.1 or so. So all directories are wrong in some sort. I'm not too deep in REXX, may be someone can help here.
The good news, I managed to install Netbeans 6.8 complete, including the modules. I got at first the error "line is too long", but from the above I saw that all kind of locale files are in it too. So I deleted all locale files except one. Did edit the file netbeans.cmd, first wrong and of course no success, re-insert other directories and I got started.
Its still not alright, I don't have icons, so the installer did not fully run. to give you an idea;