To unlock the true power of IrfanView Portable, you must download the separate Plugins ZIP package. Without this, support for modern RAW formats and some obscure graphic files is limited. Fortunately, the developer makes this easy: you simply extract the plugins folder into the IrfanView directory, and it works automatically.
IrfanView Portable is a ghost. It lives in the ZIP, runs from the RAM, and vanishes without a whisper. irfanview portable zip
If there is a weakness, it is the aesthetics. The UI looks like it hasn't changed since Windows 98. It is utilitarian—gray, boxy, and menu-heavy. To unlock the true power of IrfanView Portable,
IrfanView’s claim to fame has always been speed, and the Portable version is no exception. runs from the RAM
