file supported app for LG Android

[headhigh4r]

My LG K20 plus says when I open file manager file type not supported well why is it on my phone if I can't use it but that isn't my question is there a app that can read or support it

 

[Ralston18]

What file type?

 

[headhigh4r]

MERGED QUESTION
Question from headhigh4r : "file supported app for LG Android"

My file manager on my LG K20 PLUS says file type not supported. Wyd, how am I to be able to read them is there a app that I can download