A computer file extension is the second part of a computer file name, appearing after the dot ("."). The purpose of the file extension is to give an indication of the contents of the file through a meaningful three or four letter abbreviation. The ZVR extension is used by several different applications to store various data formats. Most of the applications are used with handheld devices such as recorders or personal digital assistants (PDAs).
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Both SAFA of Hong Kong and Philips of the Netherlands use the ZVR file extension for audio files. Each of these formats is company property and the two are not interchangeable. SAFA makes MP3 players with extra capabilities like FM radio receivers and voice recorders. Newer SAFA devices store audio files with the WMA file extension. The Philips ZVR format is called "Voicetracer." The audio files Voicetracer creates use the PC-based ZVR player for playback.
ZVR is the name of an application that creates compressed document files. Each file created has the ZVR extension. The ZVR application produces eBooks specifically for Psion hand held devices. The ZVR program produces digital documents for display on the Psion device in portrait orientation (longer edges at the sides, shorter edges at the top and bottom). The technology is implemented in two parts: a compressor and a reader. The compressor is called ZVRZ and the reader is called ZVR.
Although each implementation of the ZVR file extension has a specific function and a format usable only with the designated reader, there's nothing to stop users from trying to open a ZVR file type with another reading application. Trying to open an eBook with an audio player won't work. Although the Philips and SAFA file types are both audio formats, they aren't transferable between the applications.
Microsoft Windows uses the file extension to map between file types and the applications that open them. This association is recorded in a Default Programs database. Only one default application can be associated with each file extension. This causes problems if a user has both Philips Voicetracer files and ZVR eBooks stored on the same computer. The operating system will try to open both file types with the same application, which would be the one most recently installed. The SAFA audio file does not have a computer-based player. ZVR Converter changes the format of SAFA ZVR files to WAV files, which play in any media player. ZVR Converter does not work with eBooks or Voicetracer files.
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