Hi Charles,
Thanks, 
"Probably.  After creating the file, change the MacCreator property of  
the FolderItem to "bbBB"."
I can open it in myApp2 by dropping it on myApp2's icon, then save the new file 
and it will be saved as a myApp2 file now. But how is that done programatically?
Lennox.

Charles Yeomans <[EMAIL PROTECTED]> wrote: Probably.  After creating the file, 
change the MacCreator property of  
the FolderItem to "bbBB".

On Jul 30, 2006, at 10:53 PM, Lennox Jacob wrote:

> Great Charles.
> Thanks, I tried it and has replaced what I had.
> Thanks again.
>
> I have a new problem. That file was created by MyApp (Creator code  
> aaAA) and has MyApp's icon. When double-clicked it opens myApp as  
> expected but I want it to open another app, myApp2 which has bbBB  
> as its creator code.
> Is that possible?
> Thanks again
>
> Lennox
>
> Charles Yeomans  wrote:
> On Jul 30, 2006, at 10:16 PM, Lennox Jacob wrote:
>
>> OK,
>> This works
>
> Only if you're lucky.  Here is some code that doesn't depend on luck.
>
> dim f as FolderItem = DesktopFolder.Child("foo")
> If f is nil then //something went wrong
>    Return
> End if
>
> dim t as TextOutputStream = f.AppendToTextFile
> If t is nil then
>    //check f.LastErrorCode
>    Return
> End if
> t.WriteLine "foo"
> t.WriteLine "foo"
> t = nil //the file is closed when the object is destroyed
>
> FolderItem.AppendToTextFile creates the file if one does not already
> exist; presumably CreateTextFile fails if the file already exists.
>
> Charles Yeomans
>
>
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