Here is a diff that supports the 4.4 stuff John reports:

bash-4.2$ diff  --suppress-common-lines   Contents/Library/QuickLook/SqueakQL.qlgenerator/Contents/Info.plist Contents/Info.plist  | grep 4.4
>       <string>Squeak 4.4, VM 4.2.3b1u</string>
>       <string>4.4</string>
>       <string>Squeak 4.4</string>
>       <string>Squeak4.4-12327.image</string>

Tested on Mac OS X 10.6.8.

1. down load and unpack zip file
>> resulting file is named Squeak-4.5-All-in-One.app. The version name in Get Info is Squeak 4.4, VM 4.2.3b1u.
2. double click the file icon to launch program.
>> a Finder (file browser) opens up with the caption "Choose a File". This is the behavior on a Mac when the OS does not know what program to use to open the file.
3. When I look at the file info.plist it looks like it is from the 4.4 AI1 release.
>> extract of a section of text fom the plist (text snipped out for brevity)
--- snip
</array>
<key>CFBundleExecutable</key>
<string>Squeak VM Opt</string>
<key>CFBundleGetInfoString</key>
<string>Squeak 4.4, VM 4.2.3b1u</string>
<key>CFBundleShortVersionString</key>
<string>4.4</string>
<key>CFBundleIconFile</key>
<string>Squeak.icns</string>
<key>CFBundleIdentifier</key>
<string>org.squeak.SqueakAllInOne44</string>
<key>CFBundleInfoDictionaryVersion</key>
<string>6.0</string>
<key>CFBundleName</key>
<string>Squeak 4.4</string>
--- snip
<string>Squeak4.4-12327.image</string>
--- snip

johnreed