How can you find what a file is that has no file type designation?

[EdwardTeach]

I have a file in my documents folder called "New foldertest". I have no idea what it relates to but from the name I guess it was a file I created to test something a while back! It has no file type - its file type is just listed as "file". I would like to delete it, but preferably would like to check what it is first. It is fairly large at 20, 141kb. I have tried opening it in a variety of applications to no avail. Is there any kind of tool I could use to suss out what this is?

 

[EdwardTeach]

Good shout mr chase. I tried opening it with 7-zip and it worked. Cheers mate!