The file extension RDF identifies so-called Resource Description Framework files. The RDF is a family of standards for the representation of information on the Internet. A resource is information that can be uniquely identified by an Internet address (URI), such as a web page or an image. Rdf files are XML based text files that can be opened and edited in any text editor.
For example, RDF is used for metadata and catalog services, news aggregators, and generally for presenting information. For example, RDF files are used by the American ICRA system and Newsroom System Burli.
RDF is also used by Mozilla Firefox and Mozilla Thunderbird, among others. For example, it stores information about installed extensions.
Most often resolving problems with opening RDF files is very simple. Just install an appropriate program that supports such files. All of the listed programs support RDF files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of RDF files or offer file conversion options, but may not be capable of editing such files.
It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate RDF files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the Mozilla Firefox applications is not on the list, select "Browse" option in order to manually locate the directory where Mozilla Firefox has been installed.
Sometimes problems with opening RDF files may not lie with the application itself, but can arise due to other causes, such as: