If memory serves, Apple invented FireWire along with several other vendors and wanted to charge a licensing fee per port which largely made USB more popular.
A similar thing happened with Lightpeak, invented by Intel, but later picked up by Apple and called Thunderbolt.
I may have the politics all wrong, but finance and marketing has a lot to do with getting the technologies adopted - leadership and better design doesn't always win out in the end.
Although I never had any Firwire adapters, I had some other cards made by Vantec and they were good: https://www.amazon.com/Vantec-3-Port.../dp/B004QY9IYA
If you are going to buy a PCIe card, make sure it has the T.I. chipset. Many Firewire devices will only work or work properly if the Firewire port has the T.I. Chipset.
I can't tell throughout this thread if your question has been answered, but yes, this is the (Legacy) driver. However, to install the 8.1 .msi in Windows 10, you need to find the .inf directly and right click and Install. The .msi will not correctly install in Windows 10. I found this: Windows 10 and IEEE 1394 FireWire Legacy Drivers (Unable to Install the 8.1 drivers)
It appears the driver comes from Win 7 SP 1. This driver works with my SIIG DP FireWire 800 3-Port (NN-E38012-S3) driving a Behringer FCA1616.
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