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CCleaner是一款很不错的、免费的系统优化和隐私保护工具。CCleaner的主要用来清除Windows系统不再使用的垃圾文件，以腾出更多硬盘空间。它的另一大功能是清除使用者的上网记录。CCleaner的体积小，运行速度极快，可以对临时文件夹、历史记录、回收站等进行垃圾清理，并可对注册表进行垃圾项扫描、清理。附带软件卸载功能。 同时支持IE、Firefox。免费使用，不含任何间谍软件和垃圾程序。支持包括简体中文在内的26国语言界面！

Changes in CCleaner v2.02:
- Application is now 100% Unicode, with support added for non-Unicode OSs.
- Fixed bug where some IE temp files were not being securely deleted.
- %LocalAppData% and %CommonAppData% variable support added to INI files allowing "Application Data" references to work on non-English versions of Windows.
- Fixed bug where "Run (in Stat Menu)" was being cleaned when deselected.
- Added Gutmann (35 pass) secure deletion.
- Fixed minor bugs with 98 and NT4.
- Fixed bug with update checker.
- Added "portable.dat" file to the portable version of CCleaner which forces it to save the settings to an INI file.
- Fixed bug in cookie scanning that could cause an exception.
- Fixed minor UI bugs relating to control and window focus.
- Improved exception handling with more useful information.
- Minor bugs fixes and tweaks.