That’s Indeo Video 4(.1). You can get it from any indeo video installation package (it’ll install indeo 3, 4, and 5). Just google for iv5setup.exe or iv5play.exe. Here are some hits:
http://www.comp.lancs.ac.uk/computing/users/paul/forest/video%20codecs/
http://eps.here.ru/v/
http://nno.uni.lodz.pl/ftp/media/codec/intel5.1/