Firefox 4 beta opens instead of 3.6.13 - why?

UPDATE
I updated to 4.0b10, and apparent behaviour changed (I don't think it was doing this before, but I can't be 100% certain):
Both 3.6 and 4 Beta will now open correctly, provided that neither is already running.
If either is already running, then an attempt to open the other will instead open a second instance of the one already running.
ORIGINAL PROBLEM
I have been running 3.6.13 for a some time. Two days ago I installed 4.0b9 alongside, and at first I could use either or both.
However, now when I try to open 3.6, it appears that 4 is opening instead.
Looking at /program files (x86) / mozilla firefox/firefox .exe, the file properties still say that it is 3.6.13, and the file size is 891kb, whereas
/program files (x86) / mozilla firefox 4 beta 9/firefox .exe shows 903kb.
However, when I double click the 3.6 executable, it appears that the 4 beta browser opens.

If the add/remove programs option did not work, you can manually remove any versions that you no longer want. For details of how to remove them see http://kb.mozillazine.org/Uninstalling_Firefox
Typically, you just need to delete the installation directory to remove Firefox. user data and settings are stored in the [[profiles|profile folder]], so will not be touched when you delete the other versions of Firefox.

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