Opera 7.21 preview 3 (build 479) changelog 
(7.21 preview 3 -> 7.21 preview 2 repack): 
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Document: 
- Fixed a crash problem that could occur on navigating 
back and forth with a scaling different from 100% 

Mouse: 
- Fixed a problem that prevented dropdowns from being closed 
using the mouse on Sun machines. 

Actions: 
- Added a new flag parameter for "Execute Program" action. '%l' or '%L' 
will now be replaced with the current clicked url 

Dialogs: 
- Fixed a crash problem in bookmark property dialog box. Would crash if 
an illegal nickname was entered. 

Download: 
- More fixes for file extensions 
- Some fixes to the download dialog box to improve handling the 
situation where there is no system default handler. This allows 
the Open button to be available (not disabled) in more cases.