You don’t know if it’s a rare image format, a legacy database file, or a corrupted document. And you definitely don’t want to install five different trial programs just to find out.
You drop it on a USB stick, an external drive, or even a cloud-synced folder. Double-click the .exe , and it runs. No installation wizard. No admin rights required. No leftovers when you close it. FileViewPro portable 12
Last week, I found a .P65 file (PageMaker 6.5 from 1998). No modern app opens that. FileViewPro rendered the text and layout well enough for me to copy the content. Saved me hours. You don’t know if it’s a rare image