I downloaded an app said download complete touched to open but said cannot open file, why?

[AC Question]

i downloaded an app said download complete touched to open but said cannot open file. why

Why won't file open

 

[B. Diddy]

Re: i downloaded an app said download complete touched to open but said cannot open file. why

Welcome to Android Central! Which phone do you have? From where did you download the app? Are you installing an app from a legitimate app store like Google Play Store? Or are you downloading an .apk file?