Okay, what type of file are you trying to open? Is it a document of some sort? Where did you obtain this file?
If you don’t know the answer to any of those questions, try this:
Open up ‘My Computer’ > Click Tools > Folder Options > View Tab > Look for ‘show file extensions for known types’ and tick the box. Click Apply and then OK. After you have done all of that, navigate to this mystery file and take a note of the extension. The extension is the letters after the dot (.). Examples:
Okay, what type of file are you trying to open? Is it a document of some sort? Where did you obtain this file?
If you don’t know the answer to any of those questions, try this:
Open up ‘My Computer’ > Click Tools > Folder Options > View Tab > Look for ‘show file extensions for known types’ and tick the box. Click Apply and then OK. After you have done all of that, navigate to this mystery file and take a note of the extension. The extension is the letters after the dot (.). Examples: