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If you run .../bin/netbeans --userdir ... --jdkhome ... --open .../foo.html it works - foo.html is opened - but it also prints a message to stdout that the option was unrecognized.
I have not seen anything like that in current trunk. I've tried to open a text file and html file either with unlocked user dir or with userdir with already running instance. Always the file was opened and no warning printed. I've used: nb_all/nbbuild/netbeans/bin/netbeans --open x.html and it worked.
Seems OK currently.