FAQ: Help file does not display correctly

A few users have found that the Opus help file does not display correctly, instead showing the underlying raw HTML/XML code, or a blank window, or similar.

This is caused by something breaking part of the .htm filetype in your system's registry. Microsoft's HTML Help components will go wrong if a particular registry value is set incorrectly.

You can fix this automatically via a .reg file we provide or, if you'd rather do it by hand, via a simple registry edit.

See the FAQ entry for more information. (I'm just linking to it here so that if any updates are required we can do them in one place.)