Do files in Snow Leopard no longer open the application that made them?

With every Mac OS I've used until now (nearly 20 years) clicking on a file icon would automatically open the file in the program with which it was created. But since I began using OS 10.6 this is no longer the case. Every time I open anything I have to manually choose what app will open it, which is tedious, especially if the drives have spun down. I can't figure out a remedy for this, if one exists.
I've also noticed that file icons no longer reflect the program which which they were created--Illustrator, Acrobat, etc., as they always used to.
Any ideas about this? Is it just the way OS 10.6 works? If not, what can I do to fix it?
Message was edited by: SchenkerBob

Snow Leopard no longer uses creator codes to determine which apps open files. Now, it uses file extensions. So, whatever's set to open a file with an unique extension will open them; e.g., .doc files might not use MS Word to open them all—it might revert to the Pages app. You can change them to use MS Word, by getting a CMD+I, setting it to open with MS Word, and clicking on Change All (ensure it honors your choice).

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