where can i get that file?
As Wayne indicated you create itself yourself. Like most things in audio, there are different theories and preferences so you might try a couple of curves and listen to what works best for you.
Here are two that I created for use in REW after doing some reading. For me, I slightly favored results using the EBU curve, YMMV. You can copy and paste(just) the numbers into a text file and load into REW:
EBU Curve
20 8
25 8
31.5 8
40 7
50 6
63 5
80 4
100 2
125 1
180 0
2000 0
4000 -1
8000 -2
16000 -3
20000 -3.5
Harman Curve
31.5 6
40 5.9
50 5.5
63 4.9
80 3.7
100 2.5
125 1.3
160 0.6
200 0.2
250 0
1000 -1
32000 -6