When creating a new signature in Outlook 2003 on Vista I get the followin error when I press the Advanced Edit… button;
Could not find an editor for H (.) files
This seems to be quite a common issue but the solution is easy.
- Open Control Panel and choose Internet Options
- Here select the Programs tab
- Change your default HTML editor to another program in the list
- Press Apply
- Change it back to whatever you want your default HTML editor to be
- Press Ok
Now when you press the Advanced Editor button when creating your signature, the error should be gone.