I’ve used Selenium for our gui-test and it works. But we have some webapps that when user click on a link, a Word file opens that contains some data and has a small webapp (embedded) in the Word document. That webapp communicates with Word. Is it possible to combine my Selenium tests with WinAppDriver in the same test?
In order to click the second popup which you mentioned later in comments, try using a desktop session. Find the popup window first and then the child button and call click method as shown below.
sessionDesktop.FindElementByName("Alert").FindElementByName("OK").Click();