REGEDIT4

[HKEY_CLASSES_ROOT\.pdf]
""="ebookfile"

[HKEY_CLASSES_ROOT\ebookfile]
""="e-book"

[HKEY_CLASSES_ROOT\ebookfile\DefaultIcon]
""="C:\PortableApps\Icons\Tango\mimetypes\x-office-document.ico"

[HKEY_CLASSES_ROOT\ebookfile\Shell]
""="Sumatra"

[HKEY_CLASSES_ROOT\ebookfile\Shell\DjView]

[HKEY_CLASSES_ROOT\ebookfile\Shell\Sumatra]

[HKEY_CLASSES_ROOT\ebookfile\Shell\DjView\command]
""="C:\CLIPrograms\nircmd.exe execmd C:\PortableApps\DjVuLibre\DjViewPortable.bat "%1""

[HKEY_CLASSES_ROOT\ebookfile\Shell\Sumatra\command]
""="C:\PortableApps\SumatraPDF\SumatraPDF.exe "%1""