Windows 2000 permits file paths, including UNC paths, to be 260 characters in length. This MAX_PATH limit is can quickly be exceeded when using Group Policies, which references files in the SYSVOL using UNC paths. A typical UNC path used by Group Policy would be similar to:
\\<domain-name>\sysvol\<domain-name>\Policies\<GUID>\<Machine or User>\<GroupPolicy-Extension-Specific-Path>
If the length of the Group Policy UNC exceeds the MAX_PATH, the policy cannot be read and applied.
The fully qualify Active Directory DNS domain name is limited to less than 64 ASCII characters to avoid these problems.
NOTE: Some languages, such as Japanese, are further limited, as one of their characters may take up to 3 bytes.
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