Why is this locked? Should it be unlocked? There is no apparent reason or explanation for locking it.
The fact that no new answers can be added sucks (see this before saying locking doesn't do that), and will decrease the usefulness of the question over time. (Aren't new Windows programs still being written and released, with some occasionally becoming popular?)
Yes, unlocking would mean 1) even more duplicate answers (slightly annoying, but those get voted down to the bottom quickly or deleted by observant posters after it's been pointed out), 2) the question might get closed and reopened occasionally, and 3) it might gather some more comments too. Still, all these are much lesser evils compared to stopping the community wiki from fully evolving and keeping up-to-date.
Disclaimer/rant: I know there is a sentiment among some against all these "must-have software" questions, or against CW polls with huge number of answers in general. But in the end of the day, doesn't it weigh more that the community overwhelmingly considers this question useful, as attested by its current score of +142 and 198 users having bookmarked it?