Selecting which application opens a file with given creator/type codes (System 7)

In System 7, when the user tries to open a document of a type which multiple installed applications can open*, it pops up a dialog asking which one to use. After one is chosen, that application seems to always be used to open that type of file, by default (although it can be manually opened in the other application(s)).

How would a user bring this dialog back -- thereby allowing them to choose another default application? If it's not possible to bring back the dialog per se, how can the user change the default application?

* I'm not sure which of the type code or the creator code, or both, the Finder is using to determine the available apps and the default app to open the document. I know how to change type and creator codes using either ResEdit or -- since the System 7 I'm using is emulated on OS X -- using SetFile -c and -t from OS X. But, seemingly, the initial choice of default application makes the Finder behave a certain way for all files similar to the one double-clicked; it doesn't change the type and creator codes.