"c:\windows\nircmd.exe","sendkeypress tab"
On a side, you shouldn't need to use nircmd to invoke a tab key press. You can just look in the shortcut editor in Opera to see what command tab is tied to. Same with Enter. You can look up the command enter is tied to.
How I could go to the next frame where the mail body is ? ( tried focus next frame not work )
Hmm. Tab enough times should get you there at least.> How I could form the mail body to command Opear to the attachment widget ?
You should be able to tab or shift + tab to get to the attachment link in the header bar.
As I have tried to use command ' Save attachments to folder ' + Click Default button. But the attachment was not save (surprisingly) as I could see the save dialogue was okay I could see it pops-up & click okay by itself. Just that the document wasn't save in the folder ( I check the path of the DL folder is correct, just no document in there )
Not sure. I might play around with it if I have time and see what I can figure out. Make sure you don't have the disk cache turned off in Opera. That'll break attachment saving.