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Force Classic to open a dual-OS application Classic
There are some applications that can be double-clicked in both OS 9 and OS X, and they run equally well under either environment (AppleWorks, for example). Sometimes, you are in OS X but you want to run one of these applications in Classic mode.

If you're lucky, this is easy. Just select the program in the Finder, Show Info, and check the box marked "Open in the Classic Environment." But sometimes this box is missing. Well, here's how to make it show up.

First, keep in mind that the program absolutely must be double-clickable in OS 9 for this to work. Now, control-click on the application and choose "Show Package Contents." Then open the "Contents" subfolder and edit the file Info.plist. If Contents is grayed out in the Finder, you can use the Terminal to open the folder.

Add the following key/value pair to Info.plist:

Key: LSPrefersClassic
Value Type: Boolean
Value: True

If you installed the Dev Tools, you can use Apple's handy Property List editor to do this easily, but otherwise you will have to manually enter the XML.

Save and close the file. Now when you Show Info, the option should be there. I have tried this successfully on AppleWorks 6 and AOL Instant Messenger.
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What if it's not a bundle??
Authored by: Anonymous on May 31, '02 09:34:32AM

What do you do in the case that the app is a single program file, like most of the Office:X suite?

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What if it's not a bundle??
Authored by: balthisar on May 31, '02 11:01:33AM

Well, Office X won't run under "real" OS 9.2 anyway, so it doesn't matter.

For OTHER Carbon applications, though, that's a good question.

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What if it's not a bundle??
Authored by: sabi on May 31, '02 11:40:32AM

The equivalent of Info.plist for a non-bundled app is the 'plst' id 0
resource; you can use ResEdit or Resorcerer to edit it.

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What if it's not a bundle??
Authored by: adodd on Mar 05, '03 04:46:04PM

In some apps, such as Palm Desktop 4.0 Installer, once you do the "View PAckage Contents" and go under the "Contents" folder, there is a folder called "MacOSClassic"

Doing a "Get Info" in the application in that folder sometimes brings up the "Open in classic environment" checkbox

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Illustrator 10
Authored by: twang on Jun 02, '02 06:25:13PM

ive tried this with illustrator 10, as is has horrendous display refresh glitches which make it unusable in osx (brand new clean install dual gighz, 10.1.4, illu 10.0.1). so its basicly the reason im still in 9.2. anybody get this to work with illustrator!? ive tried, it thas the checkbox, but wont work.

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Illustrator 10
Authored by: mdouma46 on Jul 14, '02 12:56:08AM

Note: This will NOT work with Adobe Illustrator 10. I heard this from Adobe Illustrator Engineer Dave MacLachlan himself. Sorry, I forget the exact reason why. You should go to the Adobe's User to User Forums under Illustrator Macintosh and do a search for his name. It was probably a month or more ago that I heard this. Hope this helps....

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Authored by: vilennon on Jun 15, '02 06:26:50AM
Why would you go to all that trouble, when you could just open the Get Info window and select "Open in the Classic environment" ?

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