There is another problem too with this - because the content you've made is is a Paintshed reskin, the content will only work for other Trainz users who also have Paintshed installed as well (hence the many threads requesting Paintshed for download lately) - and that is only for older versions of Trainz (it doesn't work with Trainz Classics, 2009 and 2010 from what I'm aware of).
It's the reason why I've never uploaded any of my (many) Paintshed reskins - besides the fact it's a limited program with a small amount of trains you can reskin - only a comparatively small section of the community would actually be able to use the content sadly.