Nemusí být nainstalované natvrdo, ale je třeba, aby existoval záznam v registrech. Příklad pro portable Opera developer:

Windows Registry Editor Version 5.00

; Infamous capabilities:

[HKEY_LOCAL_MACHINE\SOFTWARE\Opera Developer\Capabilities]
"ApplicationDescription"="Opera Developer"
"ApplicationIcon"="C:\\Programy\\OperaDeveloper\\launcher.exe,0"
"ApplicationName"="Opera Developer"

[HKEY_LOCAL_MACHINE\SOFTWARE\Opera Developer\Capabilities\FileAssociations]
".htm"="OperaURL"
".html"="OperaURL"
".shtml"="OperaURL"
".xht"="OperaURL"
".xhtml"="OperaURL"

[HKEY_LOCAL_MACHINE\SOFTWARE\Opera Developer\Capabilities\URLAssociations]
"ftp"="OperaURL"
"http"="OperaURL"
"https"="OperaURL"

; Register to Default Programs

[HKEY_LOCAL_MACHINE\SOFTWARE\RegisteredApplications]
"Opera Developer"="Software\\Opera Developer\\Capabilities"