PortableRegistrator is described as 'Easily register any portable app as a default program in Windows. This will allow you to directly open weblinks (http/https URLs) with the portable browser of your choice' and is a System Tweaker in the os & utilities category. There are three alternatives to PortableRegistrator for Windows, .NET Framework and Mac. The best PortableRegistrator alternative is Default Programs Editor, which is free. Other great apps like PortableRegistrator are Gunners File Type Editor and RCDefaultApp.
Default Programs Editor is a powerful but simple file association utility for Windows 7, Vista and XP. This free utility has three main functions: context menu editor, auto-play editor, and default programs association editor.
Gunners File Type Editor allows you to you to create/modify various properties for file extensions. Each user can have different properties for a file extension. For example, the default program to open .txt files when you double click on a file with the .
RCDefaultApp is a Mac OS X 10.2 or higher preference pane that allows a user to set the default application used for various URL schemes, file extensions, file types, MIME types, and Uniform Type Identifiers (or UTIs; MacOS 10.4 only).
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