The original developer modified the `Function Pos(Const Substr : RawByteString; Const Source : RawByteString; Offset : Sizeint = 1) : SizeInt;` but forgot to modify the if statement in the previous function `Function Pos(Const Substr : ShortString; Const Source : RawByteString; Offset : Sizeint = 1) : SizeInt;` The attached patch makes the two functions look alike. [patch.diff](/uploads/2ca67eaa6644eb35aa395940f08408f7/patch.diff)