if you are running the 64 bit version of Photoshop (as I am) and you want it to default to the 32 bit version do this (this assumes you installed the 32 bit version along with the 64bit version during the install):
If you are uncomfortable editing your Windows Registry do not attempt this fix. I will not be responsible if you screw up your computer in any way. As a precaution its advisable to back up your Windows Registry before attempting to edit it.
1. Go to Start and in the Search box type either regedit or regedt32 to open the Registry Editor
2. Navigate to the following registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\App Paths\Photoshop.exe
3. The keys in the right pane of the Registry Editor should read something similar to the following:
Default C:\Program Files\Adobe\Adobe Photoshop CS4\Photoshop.exe
Path C:\Program Files\Adobe\Adobe Photoshop CS4\
4. Right-click each key, select "Modify" and change them to the following:
Default C:\Program Files (x86)\Adobe\Adobe Photoshop CS4\Photoshop.exe
Path C:\Program Files (x86)\Adobe\Adobe Photoshop CS4
5. Click File > Exit to save and exit the Registry Editor.
These instructions assume you have a standard installation of Photoshop. If you installed it in another location you'd have to modify the paths to suit.
also navigate to these keys and make the following changes:
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\App Paths\Photoshop.exe]
@="C:\\Program Files (x86)\\Adobe\\Adobe Photoshop CS4\\Photoshop.exe"
"Path"="C:\\Program Files (x86)\\Adobe\\Adobe Photoshop CS4\\"
[HKEY_CLASSES_ROOT\Applications\Photoshop.exe]
[HKEY_CLASSES_ROOT\Applications\Photoshop.exe\shell]
"FriendlyCache"="Adobe Photoshop"
[HKEY_CLASSES_ROOT\Applications\Photoshop.exe\shell \edit]
[HKEY_CLASSES_ROOT\Applications\Photoshop.exe\shell \edit\command]
@="\"C:\\Program Files (x86)\\Adobe\\Adobe Photoshop CS4\\Photoshop.exe\" \"%1\""
[HKEY_CLASSES_ROOT\Applications\Photoshop.exe\shell \open]
[HKEY_CLASSES_ROOT\Applications\Photoshop.exe\shell \open\command]
@="\"C:\\Program Files (x86)\\Adobe\\Adobe Photoshop CS4\\Photoshop.exe\" \"%1\""
now when you double click a photo it will open with the 32bit version vice the 64bit version. This information was found on the internet and I've done it to my system.
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