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Sandboxie Plus is a sandbox-based isolation tool for Windows that runs programs inside contained environments, keeping their file and registry changes separate from the rest of your system. It suits people who install unfamiliar software regularly, IT and support technicians, and anyone who wants a disposable space for browsing or opening downloads of uncertain origin. The practical appeal is reversibility: whatever a sandboxed program creates stays in its box, and deleting that box removes the traces, so testing an application no longer means living with whatever it left behind. Beyond basic containment, the free tier includes unlimited sandboxes, box snapshots for rolling back a sandbox to an earlier state, and per-sandbox network rules through the Windows Filtering Platform, which lets you cut one box off from the internet while leaving another connected. Maintained by David Xanatos as an open-source community fork of the original Sandboxie, the software is free for personal use, though free users see a periodic support reminder, and several modes — including privacy and security enhanced boxes, App Compartment mode, and RAM disk storage — require a supporter certificate. Commercial and educational use needs a paid Business Certificate. Two considerations matter before installing: Sandboxie is not an antivirus, since it contains programs rather than detecting them, and its isolation relies on a kernel driver rather than hardware virtualization, so it should not be treated as an absolute barrier or a venue for deliberately running known malware. If you want a lightweight, reversible way to keep untrusted software at arm's length without setting up a virtual machine, Sandboxie Plus is worth a closer look; if your main concern is everyday malware protection, a standard security suite remains the better starting point.