1) it used VLC, called from the command line. arrow keys, space bar and a few letter keys for mode and navigation.

2) I downloaded from various places. If you can post a link I'll check it out, but based on past experience the subtitles for one market only match that release of that market's movie, and go out of sync with any foreign release. For example, if you have a Chinese movie with English subtitles it was probably edited for release in an English speaking market and won't match any Chinese subtitles you might find since they would go with the Chinese release.