Hi Tacca,
thanks for the explanation! Now that I know what the file is for I ran some tests and it seems nothing was changed in DCS.
With the mod's standard oval NVG and without the laserbeam.hlsl the beam doesn't quite reach the edge of the NVG to the sides (pics 1+2) and reaches over the NVG to the bottom (pic 3), maybe still expecting the round shape of the unmodded NVG.
This effect is fixed by your laserbeam.hlsl (4+5) but leads to weird effects (6).
Hopefully, you can find a fix for that down the line!
In all cases I can see the laser spot on the target outside the NVG (when the NVG is on) but that is the same in stock DCS, too.