Hm...
choosing the first one, the last version installed was open; but I wanted to open the previous one, so I clicked the second item, getting a nice b4a crash.
Good ideas; anyway, the second "link" causes a b4a crash, so I will open the right exe every time (just for now, when the last b4a beta version will be a no-more-beta version... )
you can clean up the last opened with in registry. just search .b4a some times in regedit.exe
HKEY_USERS\S-1-5-21-3271362133-1796675707-313935223-1002\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.b4a
i can imagine that people with much projects in business solutions will have b4a 7 and b4a 8 beside.
because migration need time & money & human ressources.
You can keep many versions as you like. Open the project from the IDE.
B4A 8 is backwards compatible with B4A 7: [B4X] Backward Compatibility
There is no reason to use an old version.
In the rare case where something changes in an incompatible way it is because a new version of the OS required it so you need to upgrade any way.