🚀 go-pugleaf

Something strange just happened, and I'm mystified.

After reading the answers to my previous post about transferring
my Work menu from Word 3.02 to Word 4.0, I gave in and did it
by hand.  Up until this time, each version of Word and its attendent
files lived in its own folder at the top level of my hard disk, and
whenever I double-clicked any Word document, Word 4.0 would always
be opened.

Having finally customized Word 4.0 to my liking, I decided to discard
all the 3.02 files except for the Word application, since that is 
the only one that I couldn't recover from the original floppies
(because it was customized).  Then I moved the Word 3.02 folder
containing just Word 3.02 into the Word 4.0 folder (now called just
"Word").  Then I double-clicked a Word document, and *arrgghh*!
Word 3.02 was opened.

Further experimentation revealed that if I move the Word 3.02 folder out
of the Word folder and then back in again, everything's OK, and Word 4.0
starts up as expected. 

So the question is, how does the system decide which version of an
application to open? What did I do to make it change its mind?  I'm
running System 6.0.2 on a Mac II, 5 Meg, 40 Meg.

Cheryl