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The >> operator redirects stdout to a file, using append mode and unicode encoding. Write the BOM when redirection happens to a new file (which starts out empty). This makes the >> operator behave similarly to the > operator, when the redirection target doesn't exist originally: OutUnicode && OutAppend && FileSize == 0 // >> to new unicode file vs. OutUnicode && !OutAppend // > to any unicode file (Note that (FileSize == 0) is equivalent to "new file" in this context, due to the earlier "Check that filetypes (Unicode/Ascii) do not change during an append".) Reported-by: Lowell Dennis <Lowell_Dennis@Dell.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jaben Carsey <Jaben.carsey@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15725 6f19259b-4bc3-4df7-8a09-765794883524