Since Win-Test version 3 was released it now has the added support for RTTY contests using the MMTTY engine which is used in most Windows based contest logging programs.
Below is how to setup Win-Test for RTTY operation in the quickest and simplest way.
Downloading MMTTY Engine
Before you can get started operating RTTY, Win-Test uses the MMTTY engine by JE3HHT, so first task is to go to http://mmhamsoft.amateur-radio.ca/mmtty/index.html scroll down the page to where the title says "MMTTY Engine", download the ZIP file and unpackage the file into a folder where you will be able to find it. You will need to tell Win-Test the location of the mmtty.exe file.
Note: If you're already using N1MM Logger or WriteLog, you may already have this engine installed so it's worthwhile checking before-hand.
Win-Test RTTY configuration
Great, now you've got the engine downloaded and installed it's time to fire up Win-Test and get things setup!
Open the RTTY configuration box
Open a contest file for a RTTY contest and once it has loaded, right-click on the Win-Test background and select "RTTY configuration"
Now you've selected "RTTY configuration" you will be shown a box similar to the one shown above; here you need to click "Run MMTTY" checkbox.
In the RTTY configuration box, click the "Browse..." button and locate where you have placed the MMTTY Engine. For me it's D:\mmtty-engine165B. Select MMTTY.exe and click "open".
Note: If you wanting to do SO2R RTTY you need to remember at this point you need to have two copies of the MMTTY engine one for each radio then select the second instance of MMTTY.exe in the blank box.
Once you are happy with all the changes click "OK" to save changes.
RTTY Contesting.com: Great tutorials on how to use MMTTY.