The fuck is this?

The unp99999999.tmp files in the c:\windows\temp_avast_\ folder (is where avast unpacks/sends copies of files to be scanned) are placed there by avast so that they can be scanned, on successful completion of the scan that folder should cleared with exception to the webshlock.txt file.

https://forum.avast.com/index.php?topic=85750.0

The only gore I see here is shitty avast being shitty. 23gb tmp file.

It looks like a CPU die

I had a two hundred gigabyte temp file once...

Art.

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Actually not an error, should go away on its own. When avast scans files it stores them in a temp file for quick access to them. When the scan is done it will delete the file. It's not the best way to do it, but it works. CCleaner does something similar when you wipe free space

You't think it was a glitch, but this software is working exactly as designed. /Microsoft

This isn't an error, it's a common optimization. They're called sprites, a name that hails from the old days of video games.

When you're making a webapp or even a native application, you often have UI elements that use color gradients, rounded edges, and that sort of thing. If you want to customize the look of your application, instead of using the default UI elements, you'll create your own and store them as image files. You need a lot of these if you want the application to render well with different window sizes and such. You could store each one as a tiny image file, but there a couple of efficiency reasons you don't want to do this. If the application is local, each file on disk takes a minimum amount of space (usually 4k or 64k), so storing tens of thousands of them is wasteful. If it's a webapp, the browser would need to fetch lots of tiny files, which is slow. So instead, they collapse all these images into a single file, and then just display the right rectangles from it where they need. So instead of the software saying "display top_left_round_edge.png" it would have a lookup table and say "display 45x30 pixels starting at coordinates 125,250 in ui_elements.png."

As to why it's in your Avast folder, it's probably being scanned after being downloaded into your browser cache or installed by an application.