If you are creating a windows installer setup, the Microsoft Help Integration Wizard is probably a much better option for deploying your Help 2.x files that using the command line tool. The Help Integration creates a Merge Module you can include in your setup. This will handle un-registration automatically...

I went ahead and put my Document!X on Vista a couple of weeks ago, and have had no problems till today. Adding a hotspot to an image (.png or .gif) in a content file crashes the Doc!X IDE. I tried the same action in the same project on XP and it works fine: apparently this is a Vista bug. I'll tell...

Document! X Vista support was introduced in 5.1.0.0. It seems that both the help file and the download page have not yet been updated with this information though - I have logged this for action so the next update will contain the correct information.