WinExt System Cleaner 1.0 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The actual developer of the free program is TriSun Software Limited. We recommend checking the downloaded files with any free antivirus. The software lies within System Utilities, more precisely System Optimization.
From the developer:
WinExt System Cleaner is a 100% FREE software. It can make your computer run faster and give you some extra disk space by secure cleaning up useless or invalid system resources. It includes dozens of cleaning sub-functions, such as deleting temporary files, log files, invalid shortcuts, etc.
You may want to check out more software, such as System Cleaner, Xvirus System Cleaner or 360Amigo System Speedup, which might be related to WinExt System Cleaner.
System Optimization
File Managers