Alec,

>Does anyone have any suggestions on how to define a literal string of non-typable characters in code or as part of a header (.h) file?
>

Use the (new in VFP9) 0h prefix for binary string literals. Just specify your non-typeable characters as hex:

#IF VERSION(5) >= 900
  #DEFINE STRING_CONSTANT 0h0102+"ABCDEFG"+0h80+...
#ELSE
  #DEFINE STRING_CONSTANT CHR(1)+CHR(2)+"ABCDEFG"+CHR(128)+...
#ENDIF