Handles comparing file.field to expression|file.field.
!A [] $E7 !1 !2 // Store fileNum fieldNum
#IFSAME !3 MATCHES CONTAINS $0 $1 $2 $3 $4 $5 $6 $7
#IFSAME !3 MATCHES
#SET Q$ 6
#ELSE
#IFSAME !3 CONTAINS
#SET Q$ 7
#ELSE
#CHECK !3 _U
#SET Q$ !3
#ENDIF
#ENDIF
!A [] $E8 |CI!q // Store comparison mode
#ELSE
!A [] $E8 !3 // Store comparison mode
#ENDIF
#IF (!0>4)
!A [] $E9 !4 !5 // fileNum2 fieldNum2
#ELSE
!A [] $EA !4 // Expression
#ENDIF