Actually, you have stumbled upon a serious bug in KDE. If you set it to use a browser other than the KHTML part for Konqueror then it will also use that browser to open an HTML file. :-(Where to set up %u ?
Control Center/Kde Components/File Associations/text/html
Although I find this an incredibly BAD place. There ought to be somewhere that says, what program do use to process HTTP protocol, without regard to what the file type is.
This appears to be a logical consequence of the two level configuration for the MIME type: 'text/html'. You first need to select Konqueror as the application and then configure Konqueror to use the KHTML part as a plugin.
You should be able to choose a browser for URLs starting with 'http' while still using Konqueror to open an HTML file which resides on your system or local network.
-- JRT
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