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Explorer can consume FILECONTENTS streams with reads much smaller than the 1 MiB protocol limit. Previously each IStream::Read became a synchronous cross-VM request, including client-side path validation and a fresh file open. Give each clipboard file stream a lazy 1 MiB absolute-offset read-ahead window. Serve sequential reads and seeks within that window locally. Bypass the cache for 1 MiB-or-larger reads and for CopyTo so bulk callers avoid an extra copy. Preserve EOF, partial-read, failure, seek, and clone semantics.