How do you mean "changing dbx format to html" or "changing dbx format to rtf"?
Why do you need to?
And how did you (try to) do it manually?
I use Outlook Express in my system having Windows XP. Everything is fine here with my Outlook Express program and .dbx files. But sometimes I need to change my .dbx files into .rtf and .html format. Once I changed their format manually but it made the .dbx files inaccessible. Thanks to backup. Is there any method or a freeware (safe + effective) to change .dbx format into .rtf and .html?