Sadly front end, like “High Level” is a very relative term. For example, in compiler design, the bit that parses code is called the “front end” since the “back end” is what emits machine code. I think that’s what they mean here, the “front end” that understands D3D8 code has been added, presumably there is also a “back end” that converts the parsed/analyzed D3D8 code into valid opcodes for consumption by GPU/CPUs.
In the other direction, a UI/UX is sometimes called a “back end” when it is part of a more complex embedded project where physical controls are the “front end”.
Apparently it’s not even really all that stable, so that whole container would rapidly decompose into probably carbon dioxide (CO2) and a bunch of pure carbon (think charcoal). At least that’s my hunch. There is a Wikipedia article on the stuff, but it’s pretty short, since it’s a pretty unusual chemical (https://en.m.wikipedia.org/wiki/Dicarbon_monoxide ).
CO2 is of course extremely common. I’d love to see what a chemist can describe about a bottle of C2O though!