open sourced pdf reader

Windows lacks non money smell softwares.

If we encouter warning C4819 when building, change system setting 'Language for non-Unicode programs' to 'US/English' and reboot.

https://www.sumatrapdfreader.org/docs/Contribute-to-SumatraPDF
https://github.com/sumatrapdfreader/sumatrapdf

Tricks,

SumatraPDF.exe -invert-colors

refer to:
https://www.cnblogs.com/Steven-HU/p/14547749.html
https://www.cnblogs.com/chenxi188/p/15585702.html