Make 32 bit Photoshop CS4 the default instead of 64 bit?

It was a bit of a surprise to find that none of my 32-bit plugins would work with Photoshop CS4 x64. Most seem to work fine in the 32-bit version of PS though. Is there a way to make the 32-bit version launch by default from Bridge or when opening a PSD file instead of the 64-bit version?

I encountered this issue today as well when I installed Photoshop CS5, and discovered that my usual plugins do not work properly.
They did work properly while running in 32 bit mode.
Windows 7's extension definition sucks, that's why I rather work with the registry.
So after a bit tweaking, I think I finally cracked it.
The "Final Product" (if you will ) is two reg files for toggling 32 and 64 bit modes.
A word of caution: This is what worked on MY machine (Windows 7 64 Bit) and I cannot gurrantee it would work on other computers, nor do I take responsibility for any damage that my occur. We are playing with the Registry here, so BE EXTREMELY CAREFUL.
These codes assume Photoshop is installed in the default location. If you've altered it, make sure to modify the files accordingly first.
Before attempting to use I recommend to create a restore point, just in case something may go wrong.
Here we go:
To switch to 32 bit mode, open a blank notepad page, paste the below code and save it as "fix.reg" (NOT TXT). After saving, activate it and you're good to go.
32 Bit Mode
Windows Registry Editor Version 5.00
[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\\Adobe\\Adobe Photoshop CS5\\Photoshop.exe\" \"%1\""
[HKEY_CLASSES_ROOT\Applications\Photoshop.exe\shell\open]
[HKEY_CLASSES_ROOT\Applications\Photoshop.exe\shell\open\command]
@="\"C:\\Program Files\\Adobe\\Adobe Photoshop CS5\\Photoshop.exe\" \"%1\""
[HKEY_CLASSES_ROOT\Photoshop.Image.12\DefaultIcon]
@="C:\\Program Files\\Adobe\\Adobe Photoshop CS5\\Photoshop.exe,1"
[HKEY_CLASSES_ROOT\Photoshop.Image.12\Insertable]
@=""
[HKEY_CLASSES_ROOT\Photoshop.Image.12\protocol]
[HKEY_CLASSES_ROOT\Photoshop.Image.12\protocol\StdFileEditing]
[HKEY_CLASSES_ROOT\Photoshop.Image.12\protocol\StdFileEditing\server]
@="C:\\Program Files\\Adobe\\Adobe Photoshop CS5\\Photoshop.exe"
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell]
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell\edit]
@=""
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell\edit\command]
@="\"C:\\Program Files\\Adobe\\Adobe Photoshop CS5\\Photoshop.exe\" \"%1\""
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell\open]
@=""
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell\open\command]
@="\"C:\\Program Files\\Adobe\\Adobe Photoshop CS5\\Photoshop.exe\" \"%1\""
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell\preview]
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell\preview\command]
@="\"C:\\Program Files\\Adobe\\Adobe Photoshop CS5\\Photoshop.exe\" \"%1\""
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell\print]
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell\print\command]
@="\"C:\\Program Files\\Adobe\\Adobe Photoshop CS5\\Photoshop.exe\" -p \"%1\""
Now, if you want to revert the changes, do the same procedure with the below code, and it should make 64 bit the default once again.
64 Bit Mode
Windows Registry Editor Version 5.00
[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\\Adobe\\Adobe Photoshop CS5 (64 Bit)\\Photoshop.exe\" \"%1\""
[HKEY_CLASSES_ROOT\Applications\Photoshop.exe\shell\open]
[HKEY_CLASSES_ROOT\Applications\Photoshop.exe\shell\open\command]
@="\"C:\\Program Files\\Adobe\\Adobe Photoshop CS5 (64 Bit)\\Photoshop.exe\" \"%1\""
[HKEY_CLASSES_ROOT\Photoshop.Image.12\DefaultIcon]
@="C:\\Program Files\\Adobe\\Adobe Photoshop CS5 (64 Bit)\\Photoshop.exe,1"
[HKEY_CLASSES_ROOT\Photoshop.Image.12\Insertable]
@=""
[HKEY_CLASSES_ROOT\Photoshop.Image.12\protocol]
[HKEY_CLASSES_ROOT\Photoshop.Image.12\protocol\StdFileEditing]
[HKEY_CLASSES_ROOT\Photoshop.Image.12\protocol\StdFileEditing\server]
@="C:\\Program Files\\Adobe\\Adobe Photoshop CS5 (64 Bit)\\Photoshop.exe"
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell]
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell\edit]
@=""
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell\edit\command]
@="\"C:\\Program Files\\Adobe\\Adobe Photoshop CS5 (64 Bit)\\Photoshop.exe\" \"%1\""
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell\open]
@=""
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell\open\command]
@="\"C:\\Program Files\\Adobe\\Adobe Photoshop CS5 (64 Bit)\\Photoshop.exe\" \"%1\""
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell\preview]
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell\preview\command]
@="\"C:\\Program Files\\Adobe\\Adobe Photoshop CS5 (64 Bit)\\Photoshop.exe\" \"%1\""
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell\print]
[HKEY_CLASSES_ROOT\Photoshop.Image.12\shell\print\command]
@="\"C:\\Program Files\\Adobe\\Adobe Photoshop CS5 (64 Bit)\\Photoshop.exe\" -p \"%1\""
Reminder: If you're not sure, DON'T USE IT.

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