Assigning an app to an unknown extension
How do I get my android device (Samsung Galaxy S8 fully updated software) to open unknown file extensions using specific apps?
For instance, in Windows, I could Shift+Right Click on a file to pull up the "Open With" option for a file type, even if the file type isn't previously associated with a default app.
If I had a .TD6 file (a Roller Coaster Tycoon Track file), I could Shift+Right Click the .TD6 file, select Open With, and choose the Roller Coaster Tycoon program to open the file.
The same file type, if I try to open it using my android device, only gives me the option to "search for the appropriate app for this file in Google Play Store". How do I instead get my android to let me choose the native program for an unknown unrecognised file extension (.td6) from the apps already installed on my phone (like I have been able to do in Windows on a PC since 1995)? Or is Google Android simply 22 years behind its competitor in that regard?