i want to change my nc extension to '' .txt ''
i don't know where to put sextnc .txt


# --------------------------------------------------------------------------
#String and string selector definitions for NC output
# --------------------------------------------------------------------------
#Address string definitions
strm : "M"
strn : "N"
stro : "O"
strp : "P"
srad : "R"
srminus : "R-"
sblank : ""


#Cantext string definitions (spaces must be padded here)
sm00 : "M00"
sm01 : "M01"
strtextno : ""
strcantext : ""

#Transform mirror and rotate codes
strns_mir_on : "G51.1" #Programmable mirror image code
strns_mir_off : "G50.1" #Programmable mirror image cancel code
strns_rot_on : "G68" #Coordinate System Rotation
strns_rot_off : "G69" #Coordinate System Rotation Cancel

#Misc. string definitions
sopen_prn : "(" #String for open parenthesis "("
sclose_prn : ")" #String for close parenthesis ")"
sdelimiter : "|" #String for delimiter
sg94 : "G94" #Units per minute
sg95 : "G95" #Feed per rotation
sm29 : "M29" #Rigid tapping preperation support function
sg80 : "G80" #Cancel canned drilling cycle
sg43 : "G43" #Tool length compensation
sg49 : "G49" #Tool length compensation cancel
sg92 : "G92" #Set work piece coordinate system
sm06 : "M6" #Toolchange

# --------------------------------------------------------------------------


thanks for any help