"On the other hand, an HTA runs as a fully trusted application and therefore has more privileges than a normal HTML file; for example, an HTA can create, edit and remove files and registry entries."
You might find this interesting, a story about the development of a popular ZX Spectrum emulator Warajevo:
"The grenades fell everywhere, there was little electrical power (at one time even the hospitals didn't have power for two months!). When we had electricity it was only for 2-3 hours during the night."
I doubt it's actually active on most domains even though the RFC asks for it to be so. I would even guess that admin@(domain) might be more effective. Just a guess on my part though.
My initial thought is that signing up abuse@(domain) would be a clever irony. My next thought is that abusing the abuse inbox is probably a dick move to the sysadmin who's job it is to keep things working.