can't convert recorded video on my desktop

HI! I can't convert a recorded video from my desktop anymore. 

I used to be able to record meeting then when I click Stop, a folder appears on desktop as usual but the files in the folder are not video files and I get an error message to find application to use. Never had problem before. 

I was always able to convert video, while the meeting continued to play video back on shared screen. 

Any guidance is appreciated. thanks.