Between the several parties, the format is pretty well understood.

[tatarize]

I can successfully read and write PES v1 and PES v6 without issue though glossing over the fancier shape blocks. I have most of the data on frno7's wiki, but I feel it's a bit cryptic if there's any technical document wikis or places the data should be put to be more accessible than even this that'd be great. Wiki Link