In recent memory, this has been a version of more than one virus/worm/trojan.
The .hta extension is a give-away, since this stands for "Hypertext Application", I believe, and is in any case a desognation for an application (aka program) which is going to try to execute some sort of code on your system.
Among other things, a good reason to uncheck the default Windows setting "hide known file types". It's also a reason to turn off the preview panel in your email reader.
And, above all, as a minimum, get a real-time antivirus checker and keep it up to date.
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