7-Zip 4.51 beta

7-Zip 自 4.50 后紧急发布了 4.51

4.51 Changes:
- Bug was fixed: 7-Zip 4.50 beta could not open some .7z archives.

4.50 Changes:
- New switch for command line version:
-ssc[-] enables/disables case-sensitive mode for file names.
- Speed optimizations for AES encryption.
- Some bugs were fixed.

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