SumatraPDF, also known as Sumatra, is a PDF reader for Microsoft Windows only. The program also opens Open XML Paper Specification, DjVu, EPUB, XPS, CHM, CBZ and CBR, and MOBI files. It is written primarily by two contributors: zeniko and Krzysztof Kowalczyk
Sumatra includes free software code under version three of the GNU General Public License, while the included Unrar utility is under a commercial "all rights reserved" freeware licence, making Sumatra overall freeware.

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