I checked all of the files in the particles folder. None of them have _0
If it helps, I can show you the options the screen gives me.
The title is OGRE Engine Rendering Setup
At the top it says Rendering Subsystem-Open GL Rendering Subsystem
The options are-
Colour Depth:32
Display Frequency:N/A
FSAA:0
Full Screen: No
RTT Preferred Mode:FBC
Vsync:No
Vsync Interval:1
Video Mode:800x600
sRGB Gamma Conversion:No
I don't know what it means.