Portable Photoshop En-Fr-De-It-Es (Win | 57 MB | RS)
Graphic editor without installation.
Extract on hard disk or USB key and run PhotoshopPortable.
If you drag'n drop a file on (or open with) PhotoshopPortable: it will be opened in Photoshop.
Settings of installed Photoshop should be preserved but not sure for registration.
Many keys left in HKCR\CLSID\ if you don't want it: don't use…