What is a .tst file?

A file (icon) has appeared on my Mac Book Pro desktop. The filename is ~test~bk.tst. This file icon appeared while I was using safari online. It is FIXED in location and cannot be dragged to any new location. If I R click on this file, none of the choices have any effect except "move to trash" which, when clicked just opens a dialog with a finder logo that says, "This item cannot be moved to trash because it cannot be deleted." It cannot be opened and clicking "Info" produces no result. Even though the icon appears on the desktop, it does NOT appear in finder along with the other items that are on the desktop. What is this file? How can I get rid of it?

currycogirl wrote:
it suddenly appeared while I was surfing online.
The problem is that, unless someone happens to have come across a very similar file before, there's very little we can use. The filename extension "tst" is not really informative. It could be (it obviously isn't) a file created by ExamView; or it could be created by Pearson TestGen; or by MCC TestPoint; or it could be a printer test file. There's no central repository of what name extensions mean, just various databases which are more or less accurate.
Just before that I had done some email in Outlook
Are you positive that the file name is "~test~bk.tst" and not "~test~bk.pst"? The name extension ".pst" may be used by Microsoft Outlook.
cannot be dragged to any new location
The tilde and "bk" in the name indicate that it might be a backup file. That would account for it.
How can I get rid of it?
That shouldn't be too difficult. But we don't want to delete it if it is used by something like Outlook. I suggest just restarting the computer. If it's still on the Desktop and you still can't delete it, we'll take it from there.
Should I be worried about some kind of mal-ware involved here??
That's always a possibility, but I'd say a remote one.

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