The files listed are having the following syntax:

XX-bladey-zzzz.data

with 

XX = BL, MN or MV being the test case

y = 1, 2, 3 or 4 being the blade number

zzzz = flap, llag, tors being the deflection type

The inside structure is self explaining, the usage of the 
coefficients is described in the report IB_2007_28_SPR_4.pdf
that can be found in the Test_documentation folder.