result = InStr([start,] source, find)
What happens if the source string holds mixed data: first character is binary, followed by a string followed by binary data, etc. ?
Actually, I always get 0 even when the find string exists (and I am awaiting 1 as the position of the string).
What do I want to achieve ?
Some files (like image files) have a tag at the beginning (usually at character position 1, 0 is AFAIK a binary value). I want to be sure the internal tag = the file extension.