2.1.1083 Part 1 Section 18.18.29, ST_FileType (File Type)
a. The standard does not state that this setting can be overridden.
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In Office, this simple type is used in the absence of the byte-order mark (BOM), whose value shall override this setting.
b. The standard states that "lin" and "other" are valid values for ST_FileType.
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Office does not support the values "lin" and "other", and instead uses the value "win".