Hacker News new | ask | show | jobs
by Tomte 1251 days ago
Probably because few people used both.

.pro is also common for Prolog code, if you care about the extension clash.
2 comments
tmtvl 1251 days ago
.pro is also used by IDL and Qt. I imagine there are few two or three letter extensions that aren't overloaded.
link
DonHopkins 1251 days ago
Because .log was taken.
link