Stop models from dissapearing when importing

I when i imported my mod from 1.8.1 to 1.8.3 i realized every model was gone.

And i didn't want to recreate every model because that would take weeks.

So my Idea was when you import a old .mcr file with models those models will be send into the resources (somehow) and if those models don't have a name than the name should turn into the name of the file.

I hope this is possible

It would save a lot of time for a lot of people.

Have a Nice Day :)