Sumatra PDF 可打开的电子书格式有 PDF, eBook (ePub, Mobi), XPS, DjVu, CHM, Comic Book (CBZ and CBR) 。功能强大、体积小、便携，启动速度非常快。
https://www.sumatrapdfreader.org/download-free-pdf-viewer
64-bit builds:
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Installer: |
SumatraPDF-3.3.3-64-install.exe |
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Portable version: |
SumatraPDF-3.3.3-64.zip |
32-bit builds:
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Installer: |
SumatraPDF-3.3.3-install.exe |
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Portable version: |
SumatraPDF-3.3.3.zip |
