Open and check suspicious files Like programs, individual files can also be opened in an isolated sandbox. Sandboxie-Plus starts the default program for this file — for example Word for a DOCX file.

It’s easy to assume the files we download and install to our computers are exactly what they say they are. After all, an app with a high quality icon and a correct name to match looks legit: Why ...

If the How do you want to open this file keeps popping up in Windows 11/10, select the default app. If this does not work, use these fixes.