While "SxSI" itself is an old Japanese utility, the modern guides for its use on 64-bit Windows are hosted on community wikis:
Organizations like Sonnet Support document specific bugs, such as Windows 64-bit compatibility issues with certain high-capacity cards or PCIe interfaces. Windows 8.1 - Microsoft Lifecycle sxsi x64 windows 8 link
She never opened the link again. But sometimes, late at night, when Windows Update ran silently in the background, she’d notice a single anomalous TCP packet heading to an IP that geolocated to a data center that no longer existed—and she’d remember that the past never truly disconnects. It just waits for someone curious enough to link back. While "SxSI" itself is an old Japanese utility,
Often provides updated drivers for Qio series media readers compatible with Windows 8. It just waits for someone curious enough to link back
To fix issues related to sxsi.dll on Windows 8, use these built-in tools:
hosts archived versions of the 1.01.00.0 driver released for 64-bit environments. Driver Scape 2. Windows 8.1 64-bit ISO & Updates