That is strange Custommx3 because it works a charm here. I have made the mods to use an ini file.
The button thing would need me to have access to the mediacar source code, but I haven't heard a peep out of Coyotee.
Attached is the version that uses an ini file.
It will create one automatically if you dont have it, or you can use the following template:
[fullscreen]
x_origin=0
y_origin=55
width=800
height=545
device=1
micro=0
line=0
audio=1
Note: this should be in a file called fullscreen.ini and should be in the same folder as the fullscreen.exe application.
The defaults are what I used to get the screenshot earlier. Its dark now, so a new screenshot is somewhat less impressive
If you put the binary in the launch folder then my ini will have the same name possibly as the one that mediacar uses. This is fine, the sections will be different so it will not clash.