[in, out, unique, size_is(*pcchLength)] Returns the semicolon-delimited list of file names that are excluded from the scope. When this value is the empty string, "", no files are excluded. The default value is the empty string, "".
pcchLength
[in, out] Specifies the number of characters in pszFilenameExcludes. Returns the number of characters required to retrieve the list when pszFilenameExcludes is too small, or returns the number of characters written.
HRESULT_FROM_WIN32(ERROR_MORE_DATA) when pszFilenameExcludes is too small. In this situation, the required number of characters is returned in pcchLength.