If you are looking for information related to "sxsi" for Windows 8 x64, it is most likely regarding emulation for the Sharp X68000, a Japanese home computer. "SxSI" is a specific software driver/interface used to allow these vintage systems to use SCSI hard drives.
Visual C++ 2010 (Version 10) – Most Common x64 SxS Errors sxsi x64 windows 8 link
These eliminate the need for Windows-specific sxsi.dll entirely. If you are looking for information related to
provides translated versions of the original Japanese utilities. Are you setting this up for use with a physical Sharp X68000 SXS (Side-by-Side Configuration): This is a Windows feature
on Windows 8 64-bit often search for "sxsi" drivers. These drivers enable high-speed data transfer from cards like the Go to product viewer dialog for this item. Go to product viewer dialog for this item.
Sony SxS Memory Card Driver (v2.0.0.7100): This version is specifically optimized for Windows 8 64-bit. You can find it on Softpedia.
sxstrace parse /logfile:C:\sxs_trace.etl /outfile:C:\sxs_output.txt