The cursing has already started. You’ve installed CS4, but most of your studio’s active projects are still in InDesign CS3. Now each time you double-click on an InDesign CS3 document in the Mac Finder, it opens up in InDesign CS4.
InDesignProxy is a free utility that fixes this annoyance by working as a ’stand-in’ for InDesign. Drag any INDD file onto the InDesignProxy application, and it automatically opens your file in the correct version of InDesign.
[Update: Kris Coppieters has provided us a link to InDesignProxy 1.0.5 which allows you to set the Finder to open all INDD files this way automatically. We’ll be updating our tip later today to reflect the new version.]