Whoops, yes that is for the Editor. 
Windows>Preference>General>Editors>File Associations
If you left the "Screen Designer" out there, just select it, and then click the "Default" button.
If you removed it, then click the "Add..." button, and select: "Screen Designer"
(Note: You can't find it, if it is already on the list for file associations. Select it, and click "Default".)
I notice you can change the default Debug perspective, but maybe you cannot do that with the "Screen Designer". 
To change the Debug-Perspective, just to show it:
Windows>Preferences>Run/Debug>Perspective
So, on Debug, I can change my default perspective. Maybe it isn't allowable for the Screen Designer...
I guess you can change for Debug, because to debug a JAVA-PROGRAM, you want to open up the "java Debug Perspective" vs. Open the "IBM I Debug Perspective"....
The default perspective is "DEBUG" for the debug perspective...
-Ken Killian-
(423) 510-3129
-----Original Message-----
From: wdsci-l-bounces@xxxxxxxxxxxx [mailto:wdsci-l-bounces@xxxxxxxxxxxx] On Behalf Of Robert Rogerson
Sent: Wednesday, August 07, 2013 4:14 PM
To: Rational Developer for IBM i / Websphere Development Studio Client for System i & iSeries
Subject: Re: [WDSCI-L] Change perspective for DDS...
   Hi Ken, that preference is for the Editor.  Both the DDS Designer and my
   IBM i DDS Designer open the Screen Designer editor.  What I want is that
   it opens the perspective.
   There used to be a window when I open a DDS, now that window no longer
   appears.  Do you know how to get it back?
   Thanks,
   Rob
   On 2013-08-07 3:09 PM, Ken Killian wrote:
 Rob,
 Windows>Preference>General>Editors>File Associations
 I have mine set to:
 *.dspf --> Screen Designer(defaults)
 Just switch to your preference!
 :)
 -Ken Killian-
 -----Original Message-----
 From: [1]wdsci-l-bounces@xxxxxxxxxxxx [[2]mailto:wdsci-l-bounces@xxxxxxxxxxxx] On Behalf Of Robert Rogerson
 Sent: Wednesday, August 07, 2013 2:58 PM
 To: Websphere Development Studio Client for iSeries
 Subject: [WDSCI-L] Change perspective for DDS...
    Hi all, I've checked the archives and looked around the preferences but
    can't find what I'm looking for.
    When I open a display file (DDS) I see the window "This kind of editor is
    associated with the DDS Design perspective.  Do you want to open this
    perspective now?".
    I created an IBM i DDS Design perspective.  How do I get RDi (V9) to open
    my perspective when I open a DDS?
    Thanks,
    Rob
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