[imp] Imp.reg problem

[David Chang]

When click mailto hyperlink in any webmage ,i got Horde login screen not compose
window even i have already logined to Horde.

Here are my situation:
OS:Win2000 professional + I.E 6.0

Imp.reg like this:
======================================================================
REGEDIT4

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail]
@="Imp"

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Imp]
@="IMP"

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Imp\Protocols]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Imp\Protocols\mailto]
"EditFlags"=hex:02,00,00,00
"URL Protocol"=""
@="URL:MailTo Protocol"

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Imp\Protocols\mailto\shell]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Imp\Protocols\mailto\shell\open]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Imp\Protocols\mailto\shell\open\command]
@="iexplore.exe -nohome
webmail.thbuo.gov.tw/horde.beta/imp?action=compose&to=%1"

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Imp\shell]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Imp\shell\open]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Imp\shell\open\command]
@="iexplore.exe -nohome webmail.thbuo.gov.tw/horde.beta/imp"
================================================================================

horde/conf.php
========================================================================
$conf['auth']['driver'] = 'application';
$conf['auth']['params']['app'] = 'imp';
========================================================================