Free graphic and photo viewer without installation.
Download Portable XnView Full Online (0.3 MB)
Download Portable XnView Standard Online (0.3 MB)
Copy Adobe Photoshop Plugins (*.8bf) in Data\8bf
Edit XnViewPortable.ini to fix Cache:
Cache=Temp Cache set in Windows Temp folder deleted when leaving
Cache=Portable Cache set in Data\Cache
If you drag'n drop a file on (or open with) XnViewPortable: it will be opened in XnView.
Settings of installed XnView should be preserved.