SlyEdit: Open the quote file in "binary" mode (only applicable on Windows; same as the fseditor change)
From the fseditor commit message for this change:
If the quote file contained a Ctrl-Z (ASCII 26) char, it would be truncated
at that point. Some UTF-8 messages that include a "right arrow" unicode code
point are translated to ASCII Ctrl-Z (ASCII 26) char, which is interpretted
by Windows as "EOF" (end of file) marker for files open in "text mode" and
the file won't be read beyond that char.
