US International Extended Keyboard Layout. Basically the US Int layout you can get in Linux, but for Windows. The description of the keyboard with all available characters can be found here: http://dry.sailingissues.com/us-international-keyboard-layout.html
The main benefit is that it includes far more dead keys for accents than the standard US Intl Keyboard from Windows.
/usintext directory contains the executable setup and installation files. However, if you have the Microsoft Keyboard Layout Creator tool (download for free from https://msdn.microsoft.com/en-us/goglobal/bb964665.aspx) you can compile or customize your own with the project file included in the root.
After installing it, in Windows, go to Settings > Time & Language > Region & Language, and under Languages, add English (United States) if you had not already added it. After that go to Options, and under Keyboards you should see "United States-International - Extended", which is the layout corresponding to this project.