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Which file should I change the extension of?
http://forums.ag.ru/?board=heroes5&action=display&s=0&num=1192719850&start=125
#149
This is a bug fix for version 3.0, but it will also work for version 1.6.
You need to extract the file 30missionscript.h5u from the archive.
For version 3.0, simply copy it to the UserMods folder in the installation directory of Tribes of the East.
For version 1.6, rename the extension from h5u to h5m, so it becomes 30missionscript.h5m, and copy it to the Maps folder in the installation directory of the original Heroes version 1.6.