Mailto missing from registry (& Associate File Type or Protocol List)

[highstream]

External email client compose window doesn't open from mailto

Recently developed problem (perhaps since a new clean install of everything on SSD):

- Opera 11.62/12b or Waterfox 12 browsers, email client (Sylpheed) set as Windows default, set as Opera and Waterfox mailto default with the following command/parameter
C:\Program Files (x86)\Sylpheed\sylpheed.exe --compose mailto:%t

- If email client is closed, mailto link opens client and compose window with address (good)
- If email client is open and command used without parameter, focus shifts to email client (no compose window) - that's as it should
BUT
- If email client is open, mailto link --> nothing happens

The latter is the problem.

In addition, right now mailto is not showing in "Default Programs > Associate a file type or protocol." Can't figure out why. However, when it did, setting Sylpheed as default mailto had no effect on the main problem.

Any ideas? thanks,

 

[highstream]

Retitle: Mailto links require numerous links to open compose window

Since my OP, I've got the registry settings such that the external email client, Sylpheed, is seen as the default email client and mailto program by Windows, as well by Opera, FF and IE9 browsers. What's really odd now is that it take numerous repeated quick mouse clicks with any of those browsers to get a compose window to open in the condition where Sylpheed is already running. I've got Windows set to single-click open, but that doesn't make any difference with mailto links - and only mailto links. Not sure what to make of it, since it didn't use to act this way. Any ideas? Sylpheed is text-based if that is at all relevant.

(example mailto links: http://mc-computing.com/HTML_Examples/MailTo.htm)