Outlook writes signature .htm files in the system ANSI code page
(windows-1251 on Russian Windows) without a BOM, but File.ReadAllText
defaults to UTF-8 for BOM-less files - mangling Cyrillic into
replacement characters. ReadSignatureHtml now checks BOM, then a
<meta charset> tag, then falls back to Encoding.Default (the actual
system code page) before ever assuming UTF-8.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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