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`filename*` percent-encodes every character of the title, and the client decodes that back before showing the name — so a title of "evil<U+202E>gnp.exe" was offered as "evil.exe.png", with the extension the user reads not the one the file has. Replace the bidirectional formatting characters and control characters before encoding. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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filename*percent-encodes every character of the title, and the client decodes that back before showing the name — so a title of "evil<U+202E>gnp.exe" was offered as "evil.exe.png", with the extension the user reads not the one the file has. Replace the bidirectional formatting characters and control characters before encoding.