It won't let me open the file..it has a question mark icon to the left of file. How do I now what type of file it is?

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It won't let me open the file...it has a question mark icon to the left of file

I'm trying to open a file from the device storage and it says unable to open file... To the left of the file there is a question mark icon...so I don't know what type of file it is.. Help
 

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Re: It won't let me open the file...it has a question mark icon to the left of file

Welcome to Android Central! What are you using to locate the file, a file manager app? Long-press the file, and see if there is a Details option that appears--that might tell you what kind of file it is.

What is this file anyway? It may be in a proprietary format that can't be read by any Android app.