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The most important file types used in Windows, Mac OS and Linux/ Unix, grouped by their extension's first letter.

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File types by extension - J

These are all file name extensions starting with letter J.


  • .jar - Java Archive
  • .java - Java source file
  • .jnl - CVS journal file
  • .jpg - JPEG graphics file
  • .jpeg - JPEG graphics file
  • .jpe - JPEG graphics file
  • .jfif - JPEG graphics file
  • .jpr - JBuilder project file
  • .jpx - JBuilder project file
  • .js  - JavaScript file
  • .jsp - Java Server page


Generated 20:02:30 on Oct 19, 2019