The correct way to specify a numeric range is <n..m> with only 2 dots between n and m. Sorry about the typo in our help documentation that will need to be corrected.
The Quest help explains the following Edit Mask option:
• <n…m> – restricts the user input to the declared numeric range, e.g.: <0…255>. The numeric range mask part must occupy multiple characters of the mask.
But I cannot get it to work. Is there a particular way the range is supposed to be entered that is not explicitly described here?