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(tool, file format)
An archive format for the IBM PC. ARJ files are handled by the ARJ program, created by the American programmer Robert Jung.

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A compression program for backup archiving from ARJ Software, Inc., Norwood, MA ( Introduced in the early 1990s and created by Robert Jung (the RJ in ARJ), ARJ never achieved the popularity of PKZIP, although it is considered a worthy competitor. See JAR.
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