TWINUI Query

Recently, when I try to open a pdf file from a browser, whether Edge or Google, I get a security warning that an unrecognizable app is trying to open a file on my computer. The app is TWINUI. I searched for this on the internet and it said it's a MS app called Table Windows User Interface. It said it pops up because there isn't an app associated with the pdf file type selected in my settings. The problem is that I do have an app selected in my settings. I switched to Xodo to view my pdf's. I had Adobe DC Reader but got rid of it because it kept running different things in the background. My question is how do I get windows to recognize Xodo so the warning will go away. It only happens when I'm in an internet browser. If I open a pdf from file explorer, it opens in Xodo. Any suggestions? Thanks in advance.

I don't know what caused this, but after doing some searching, I came across something that seems to have worked. I right clicked on a pdf file in file explorer and selected 'open with'. I chose a different pdf reader that I have on my pc. I opened the pdf file and then closed it. I went to settings and changed the app associated to pdf's to the app I just used. Then I opened a browser and opened a pdf to check to see if it would work. And it did. So I went back to app settings and changed the app associated with pdf's back to the original app. Went back to the browser and tried opening the pdf file again. And it opened in the original app. The TWINUI was gone. Don't know why but I'll take it. But I'm going to wait and try it a few more times before I mark it as solved.