1. You should use the SPost not MPost. and the command line should be one wrong.
The output of NC program which your need is .ncc or .pid ? Please change the last two line and let the last two extension to be same. Like these:
Status MotionMaster Dual Table 5 axis Router Fagor8055
Command "C:\SURFCAM\Velocity4\INC2APT" -I "%p%n" -O "%p%N.apt"
Command "C:\SURFCAM\Velocity4\SPOST\SPOSTM" "%p%N.apt" 115 "%p%N.pid"
Task "C:\SURFCAM\Velocity4\editNC\editNC" "%p%N.pid"
2. The file extension for SPost should be UNCX01.P115 and UNCX01.F115, there are under the C:\SURFCAM\Postlib\SPost\ for your 5 Axis Machine. Also, you could not use SPost Configuration to modify your Post file which the extension are UNCX01.Pxxx and UNCX01.Fxxx
The SPost Configuration could modify UNCX01.Pxx, UNCX01.Pxxxx and UNCX01.Fxx , UNCX01.Fxxxx
Please change your surfcam.pst as intem# 1 and repost your NC opreation again.