I have noticed something strange even since I have copied Notepad++ into my PortableApps directory, i.e. to be able to use it from Portable Apps Menu.
Before when Notepad++ was in "Portable Program Files" on the root of the same drive that PortableApps Menu is installed, I could associate Notepad++ to all xml files.
Now, when I delete the f:\Portable Program Files\Notepad++ directory and then try and associate f:\PortableApps\Notepad++\Notepad++.exe to xml files, it does not recognise it as a program.
To associate files, I right click on a file, then choose "open with...", "Choose Program..." and then "browse..." for the program file.
I have never installed Notepad++ on this notebook so it could not have been that the installation program wrote files to the registry.
Any ideas what the problem can be?