How well does that function work?
I have Rev and AOD but I do not own HOI2.
I guess if it works well, it might be worthwhile to go ahead and get hold of HOI2.
The ingame one is broken.
It will covert the victoria save, but it will not allow any of the events of HoIDD to work, no secret weapons, no abombs and no random events.
And if you liberate countries they will have no tech teams so they never do any research.
Fortunetly there is a better fan made converter, that isn't perfect (it doesn't convert any attached brigades besides tanks) but all the HoI evetns work, and it cuts the size of all victoria military in half (so if England had 150 dreadnaughts, it will only covert 75 of them, and they will be the old almost useless lv1 BB of HoI2).
If you want it, download it from here;
http://www.ederon.net/Programs/VicToHoI2Converter/tabid/129/language/en-US/Default.aspx
But I can tell you its great fun to go from 1836 to 1964 with the same nation, in my latest conversion game, France is the leader of the allies and the most powerful nation on earth, in 1946, and has managed to defeat germany and japan with its alliance partners. France is allied to the USA, Finland (which was created in vicky by me), Bulgaria (same as Finland), Albania, (again, the same) and the Phillipiness, also created when i was playing Vicky to be French puppets.
The Conversion, gave me 15 carries and 30 BBs, as well as 10 Armored divisions and about 80 infantry divisions.
The key though, is in vicky you MUST develop heavy industry (steel, autos, eletrical parts, machine parts, airplanes, cars and telephones) as these are the factories that convert into HoI2 'IC' production points. other goods convert at a lesser rate.