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Changelog:
- Added auto delimiter detection, multi-encoding support
- Added illegal XML character sanitization
- Expanded supported file types (TSV, TXT, TAB, DAT)
- Fixed sheet name truncation collisions
- Added unique sheet name generation with suffix handling
- Removed destructive BOM file modification
- Added output directory auto-creation
- Auto-split files exceeding Excel 1,048,576 row limit
- Each split sheet includes original headers
- Part numbering in sheet names (Pt1, Pt2, etc.)