We have some clients that have digital signage, typically made by companies like Daktronics, Barco and others. While the LED electronic signs and video screens are amazing, their software and input formats are not.
The Daktronics systems require .avi files compressed using really old codecs. Same with some banks that have screens that play video on ATMs and the like. The screens are modern, but the video codecs they take are not. Maybe that's part of it. We ended up getting the manual for the Daktronics board we output videos for and found that they had a software update that would add .wmv as an option. But the client was unwilling to update their software. Oh well. We gave them what they needed/wanted.