Thank you for pointing me in the right direction! It actually turned out to
be even easier than described. I connected the camera so that I could see it
in Explorer, right-clicked on it as advised, and I got a dialog that made it
even easier than the "Autoplay" instructions you described. The ensuing
dialog had a tab called "Events", and down about halfway had a section called
"Actions". The first choice, "Start this program", had a drop-down list of
all the programs I had previously seen before I made the goof, and the
CameraWindow program was chosen. The next Action choice underneath was
"Prompt for which program to run". I checked this button, and voila! I have
my choices back! This is so cool--now I can go back and forth if I want the
camera to default to the CameraWindow, or have a choice.

I'm also glad this worked, because I checked the reference you made to the
Registry, because I was curious, and I do not have the
"UserChosenExecuteHandlers" sub-key. All I have there is
"EventHandlersDefaultSelection", and "UserDefaults"--neither of which
mentioned the camera.

So thank you very much for aiming me in the right direction, and for adding
to my personal knowledge base!

"Ramesh, MS-MVP" wrote:

> If the drive-letter is shown in My Computer for the Canon camera, then
> right-click the drive, and choose Properties. Click the Autoplay tab, and
> choose the desired application there.
>
> Alternately, start Registry Editor (regedit.exe) and navigate to the
> following branch:
>
> [HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\Explorer\AutoplayHandlers]
>
> Export the branch to a REG file, using the File/Export menu option.
> Then, delete the sub-key named "UserChosenExecuteHandlers"
> Close Regedit.exe
>
> Note that this resets the Autoplay preferences for _all_ the removable
> drives in the system. You may need to reconfigure them again.
>
> --
> Ramesh, Microsoft MVP
> Windows XP Shell/User
>
> Windows XP Troubleshooting
> http://www.winhelponline.com
>
>
> "HLMencken" <HLMencken@discussions.microsoft.com> wrote in message
> news:EAA76F4C-EE71-4F23-AEAB-A9FF8A96CFB9@microsoft.com...
> I did a bonehead thing when I was troubleshooting a problem recently, w/my
> new Canon SD550 camera connecting to the Canon software in Windows. When I
> first connected the camera, I got the usual dialog box of all the various
> programs on my machine that could connect to the camera and download
> pictures
> (Adobe Photoshop Elements, ACDSee, the Canon CameraWindow, etc.).
>
> The bonehead part comes in when I checked the "Always perform this action"
> w/the "Canon CameraWindow" selected. Now when I connect the camera, the
> Canon
> CameraWindow always starts, never giving me a choice of which program I
> actually want to use. D'oh! Yes, I know it's doing exactly what it's
> supposed
> to do. Problem is, I want the dialog box of choices back, and I don't know
> how to get it.
>
> W/a simple file association, I know you can go into My Computer>Tools>Folder
> Options>File Types tab, and scroll down until you find the file type you
> want
> to change the association to. Trouble is, the camera is of course a hardware
> device, and I have no idea where to look for the magic place to undo what I
> did. It is *not* in the File Types list.
>
> I've hunted thru the Registry, scoured the KB, and have simply run out of
> ideas. Can anyone tell me how to undo a device association to a particular
> program?
>
>
>