Open .ts files on android
I believe that it depends on your file manager how a file will be opened. So here's a workaround. Download a file manager called Amaze, find the file you are looking for, press on the three dots next to the file name, and select "open with" this will allow you to open the file in any app you want to. 

I only tested this with amaze file manager, but I would imagine that the same options exist in other file manager apps.