Hey, Basically every ndo module uses .o extension. At least ndo, mod-gearman, dnx and livestatus. Thats all i know. This change screws every existing naemon installation. Not that there are so many yet, but we should be very careful when changing fundamental things. So if the only reason for this change is, that this is more correct in terms of describing the file content, i'd vote for keeping things like they are unless we have a good reason to change that.
Sven
