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System32 File Changer is a small, portable and free application with a name that pretty much sums up its functionality: it enables users to replace files that exist in the Windows System32 directory.

Although it comes packed with very simple options that can be handled even by users with no experience in computer software, it is highly recommended that only experts use this app, due to the possibility of making the operating system unusable by destroying critical files. Needless to say, creating backups before attempting any changes is a good idea.

Since installation is not a prerequisite, you can drop the executable file anywhere on the hard disk and just click it to run. It is also possible to save System32 File Changer to a USB flash drive or other similar device, in order to use it on any workstation with minimum effort and no prior installers.

An important aspect to take into account is that it does not add new entries to the Windows registry or Start menu, leaving it clean after removal. Administrative rights are required to run it.

The interface is made from a small window with a minimalistic layout, where you can use the drag-and-drop method to point out files that you want to replace with other items. It is possible to make the frame stay on top of other windows, as well as to restart Explorer from this panel.

System32 File Changer has a good response time and quickly replaces files. No error dialogs were shown in our tests, and the program did not hang or crash. The uncomplicated app serves its purpose.