You're here because you have a file that has a file extension ending in .vault. Files with the file extension .vault can only be launched by certain applications. It's possible that .vault files are data files rather than documents or media, which means they're not meant to be viewed at all.

A Fontcase vault file contains a list of different font types and other details associated to each font type entered in the Fontcase vault file. These Fontcase vault files are created by the Fontcase application, a program designed with a set of integrated functionalities used in adding, pruning and managing a list of font types used in a Mac OS X system. These Fontcase vault files are implemented with text and binary data formatting attributes proprietary to Bohemian Coding, developer of the Fontcase application. A Fontcase vault file is also integrated with data encoding standards used to store the content of a Fontcase vault file in the VAULT format, the standard file format deployed by the Fontcase program for its supported lists of font types and details. Affixed with the .vault extension, the content of a Fontcase vault file may also include metadata details associated to each corresponding font type entered in the Fontcase vault file, aside from reference information about the font data itself. User-developed fonts as well as system-wide fonts and shared font types are supported by the Fontcase program and these Fontcase vault files. Some of the metadata details stored in a Fontcase vault file is the status of a font type included in the list, whether it has been activated or deactivated by the Fontcase user. This program automatically loads and saves font types entered by the Fontcase user in the appropriate directory of the Mac OS X system.

Launch a .vault file, or any other file on your PC, by double-clicking it. If your file associations are set up correctly, the application that's meant to open your .vault file will open it. It's possible you may need to download or purchase the correct application. It's also possible that you have the correct application on your PC, but .vault files aren't yet associated with it. In this case, when you try to open a .vault file, you can tell Windows which application is the correct one for that file. From then on, opening a  .vault file will open the correct application. Click here to fix .vault file association errors

Be careful not to rename the extension on .vault files, or any other files. This will not change the file type. Only special conversion software can change a file from one file type to another.

A file extension is the set of three or four characters at the end of a filename; in this case, .vault. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically. When that program is no longer on your PC, you can sometimes get an error when you try to open the associated file.