btfx:firesmoke4_scr_tex
0x30000674 10 0.5 16
0 1 0 2
150 30 150 -300 -60 -300
3.5 2.0  10 10 -1 0
2.5 2.5 2.5 -5 -10 -5
7 3
2.00 0.70 0.20 2.00     0.00 0.00 0.00 0.00
1.00 0.30 0.00 1.00     0.00 0.00 0.00 0.00
0.0 -0.20 -0.50  -0.50     0.00 0.00 0.00 0.00
0.0 0.00 0.00  -2.00     0.00 0.00 0.00 0.00
10 1
1.5      0.5

format of psfx file is (NO BLANK LINES UNTIL END!)
%s texture
%d identifier %d maximum_issue %f release_period %f rate
%f px %f py %f pz %f pv
%f velx %f vely %f velz %f velxv %f velyv %f velzv
%f rad %f radv %f exp %f expv %f dexp %f dexpv
%f accelx %f accely %f accelz %f accelxv %f accelyv %f accelzv
%f atten %f attenv
%f sRi %f sGi %f sBi %f sAi %f sRiv %f sGiv %f sBiv %f sAiv
%f sRo %f sGo %f sBo %f sAo %f sRov %f sGov %f sBov %f sAov
%f eRi %f eGi %f eBi %f eAi %f eRiv %f eGiv %f eBiv %f eAiv
%f eRo %f eGo %f eBo %f eAo %f eRov %f eGov %f eBov %f eAov
%f color_warp %f alpha_warp
%f duration %f durationv

NOTE top  4 bits of identifier control immunity
     next 4 bits set 'do dots' if any bits are set
     see sparks.pfx for a dotty one