Contains settings and preferences used by the Windows operating system; may also be used by other applications to store program settings; should not be opened manually.

Contains user preferences for a form created with FileNet eForms electronic form design software; saved in the user's "Template Preferences" folder for each form accessed.

Form that contains plot requests for eQuorum's Plot Station, a program for managing plotting jobs; saved in an ASCII text format and includes instructions and parameters for generating the plotted output; may be created by Plot Station Client and is processed by Plot Station Server.

Stores preferences for ClarisWorks, such as toolbar positioning and Welcome screen options; should be named "CLWORKS.PRF" and placed in the CLARIS directory; can be deleted to restore the program's default preferences.

ClarisWorks is a Macintosh productivity suite developed by Apple that was later also made available for Windows computers. It was later replaced by AppleWorks.

Stores program settings for Adobe Director (formerly Macromedia Director); may also contain settings for Director Xtras, such as Media Lab's PhotoCaster.

The main Director settings file is named "Director.prf."

User profile referenced by Microsoft Outlook that contains user information and preferences; includes mail account settings, signatures, references to mail folders, and other settings; when Outlook imports a PRF file, the user profile settings are immediately updated.

PRF files can also be created using Microsoft's Office Resource Kit. The files can then be deployed to multiple systems using the Custom Installation Wizard (CIW) or other maintenance wizard included with the Office Resource Kit.