There’s a common problem when there are multiple versions of applications like Adobe InDesign, QuarkXPress, Adobe Illustrator installed on the same computer.
Double-clicking a file’s icon will often cause the wrong application version to launch. As a result, you might unwittingly re-save a document into a more recent file format, which could be a bad thing. Maybe it’s a customer file, and the customer might not be able to open the updated file when you e-mail it back to her.
