Hi,
Please add the following code to App\AppInfo\Launcher\WinDjViewPortable.ini file (It will add the ability to launch files with *.djv & *.djvu extension just by double clicking the file if the program is open):
[Launch]
RefreshShellIcons=both
[RegistryValueWrite]
# File Extension Associations #
HKCU\Software\Classes\.djv\=REG_SZ:DjVu.Document
HKCU\Software\Classes\.djvu\=REG_SZ:DjVu.Document
HKCU\Software\Classes\DjVu.Document\=REG_SZ:DjVu Document
HKCU\Software\Classes\DjVu.Document\DefaultIcon\=REG_SZ:%PAL:PortableAppsDir%\WinDjViewPortable\WinDjViewPortable.exe,0
HKCU\Software\Classes\DjVu.Document\shell\open\command\=REG_SZ:"%PAL:PortableAppsDir%\WinDjViewPortable\WinDjViewPortable.exe" "%1"
HKCU\Software\Classes\DjVu.Document\shell\open\ddeexec\=REG_SZ:[open("%1")]
HKCU\Software\Classes\DjVu.Document\shell\open\ddeexec\Application\=REG_SZ:WinDjView
HKCU\Software\Classes\DjVu.Document\shell\open\ddeexec\IfExec\=REG_SZ:[rem open]
HKCU\Software\Classes\DjVu.Document\shell\open\ddeexec\Topic\=REG_SZ:System
[RegistryCleanupForce]
1=HKCU\Software\Classes\.djv
2=HKCU\Software\Classes\.djvu
3=HKCU\Software\Classes\DjVu.Document
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We will be adding extensions in some form to the platform proper later. This method does not work properly on Windows 8 and later due to Microsoft's protections against apps stealing extensions. Details and discussion are here: https://portableapps.com/node/52680
You're welcome to use one of our tools like eXpresso or Portable File Associations in the forums until then.
Sometimes, the impossible can become possible, if you're awesome!