I'd use Coollector to see what movies I own in which a certain actor appears
This is easy, you just go to the actor then tick the "owned" checkbox.
then be able to print a list of just those movies the actor appears in.
Unfortunately it's not possible to print the list, and I'm sorry to say that I don't plan to make it possible in the future. Why not? Because I won't make the interface of the program more complex by adding a feature that's only useful to a handful of users (I say "a handful" but I wouldn't be surprised if you were the "only one").
Currently I do something very similar using aliases (similar to symlinks), but they take up megabytes each, whereas text files would be only kilobytes.
I don't understand why do you do that. Please explain...
Why use txt files when Coollector gives you the result in 2 clicks?