Some still used your mentioned defined standard to save such ranking information (metadata) right before game ends.
But now instead of bots doing such things automatically, the game replay needs to be saved, and anyone can upload the game-replay at any time at a for this specified site:
Warcraft III Stats
The linked site is aware of the format of saved data, and it will use the replays's metadata to re-create the statistics on their website.
The used standard is W3MMD vjass library.
PBug90/w3gPlus
The W3MMD library isn't really updated, due to it's just very old. It for example doesn't support 24 Players in it's native form. And I would definitly recommend to read its documentation before using, as some reported desync issues, or other potential issues. I'm not very sure though if reports are legit, or not.
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.pld files are created somewhere under
"Documents\Warcraft III "