It was 600 megabytes of ancient magic.
To connect to an Oracle 9i database from a 64-bit Windows 10 machine, you must use one of the following compatibility strategies: 1. Recommended: Use the Oracle 11g Release 2 Client Oracle 11g Release 2 (11.2.0.4) Oracle 9i Client Download For Windows 10 64-bit
If you provide your exact use case (e.g., connecting to an old Oracle 9i database), I can offer more specific guidance. It was 600 megabytes of ancient magic