(if you don’t have one, use the 30-day trial for testing).
Windows 10 64-bit uses the WOW64 (Windows 32-bit on Windows 64-bit) subsystem to run 32-bit applications. While many 32-bit apps from the XP era run perfectly fine on Windows 10, Oracle 9i is a complex system involving deep kernel hooks, specific Java Runtime Environments (JRE), and memory management techniques that often clash with modern OS security protocols and architecture. Oracle 9i Download-- For Windows 10 64 Bit
You cannot simply install the standard Oracle 9i binary on Windows 10 and expect it to work out of the box. It requires a "hacky" approach and manual intervention. (if you don’t have one, use the 30-day trial for testing)
: Licensed users may still find older media packs on the Oracle eDelivery portal. Search for "Oracle9i Database Release 2". (if you don’t have one