Does anybody know what a WRL. tmp file is?

A few years ago, for some reason, these started showing up in my Documents folder but only on the C drive. Nearest I can figure, when I open a file from, that folder, it creates one of these, for some reason but, I never saw them before until about 6 or 7 years ago. It looks to me like there's a number of "hidden" things in that folder that are visible, for some reason. Someone suggested I can just delete these WRL's so, I did but, they keep coming back when I open another file. I had well over 100 before I deleted them. Now, there's at least 100 more! I'm just concerned that, by deleting them, I might also be deleting some of my info.

Does anybody know what a WRL. tmp file is?
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