2.1.1023 Part 1 Section 22.214.171.1246, RIGHTB
a. The standard does not specify which languages support DBCS.
In Office, the languages that support DBCS include Japanese, Chinese (Simplified), Chinese (Traditional), and Korean.
b. The standard does not specify behavior of RIGHTB when default language supports DBCS and when it does not support DBCS.
In Office, when the default language supports DBCS, RIGHTB counts each double-byte character as 2 bytes, and each single-byte character as 1. When the default language does not support DBCS, RIGHTB counts each character as 1 byte.