Since this stops halfway to xFF, there are many other possible two character hex codes. Everything from x80 through FF. It has become a non-standard “standard” practice to map these to other characters. This mapping depends on what character set you are using. For instance, there is a mapping for the Cyrillic alphabet, the Greek alphabet, etc. Each of these character mappings use the hex codes greater than x7F. Word processing programs and other text generation programs can use a default character mapping and add in 128 more characters. But they are not ASCII text files and rely on the use of the appropriate character mapping.
All Visionary software is designed to use the ASCII character set.