MacOS
This article applies on macOS: There are some Caveats.
If you use a separate display for your Video, you'll notice you now have an obtrusive Menu Bar on the Video screen, even if you go "Full Screen". Super annoying, i know.
Option 1:
You can get around this by going to kJams->Preferences->General, and Checking the box that says:
Video window floats above all system windows (When Full Screen)
WARNING: If you check this box, it is POSSIBLE, however unlikely, that a system dialog box will open UNDERNEATH the Video window (eg: an alert dialog, the open/save dialog, a "can't eject" dialog, or any number of other, really important dialogs). The problem is you'll never know this dialog came up, because it's hidden under the Video window.
So if you find kJams or your machine hanging and you don't know why, click in the Video window to get out of Full Screen mode, and see if there's a dialog looking for some input!
Option 2:
if you are willing to go without "separate spaces on each display", you can simply turn it off, and return to the "one menu bar" setup.
- apple->system preferences->desktop and dock
- scroll all the way down to "mission control"
- turn OFF "Displays have separate Spaces"
- restart your mac it it asks you to
The menu bar will no longer appear on all displays
Playing KMA, WMA, WMV files
You can play these with a paid version of Flip4Mac
Files appear grayed out (disabled) when you go to "Add To Library…" them
See the article about files appearing Disabled.