A char has always 8 byte in Lite-C and is always unsigned, so you have the full range of 0-255. Whats displayed on eg. TEXT elements has nothing to do with this but only with a) the used font and b) how the glyphing system of Gamestudio works.

Anyway, if you still use the same encryption like in the last thread: Please, throw it away together with the coder who proposed it as secure! Its not secure, its easily breakable in a few _SECONDS_!