What happened to my ORACLE.INI file?

Normally your WIN.INI file will contain an Oracle section indicating where your ORACLE.INI file can be found. Eg:

[Oracle]
ORA_CONFIG=c:windowsoracle.ini

Oracle's Windows95 and NT compliant (32-bit) products do not use the ORACLE.INI file but store parameters in the Windows Registry. You can edit the Registry by running the REGEDIT.EXE program (REGEDT32.EXE on NT).

To copy settings to a different machine, export the
HKEY_LOCAL_MACHINESOFTWAREORACLE key using REGEDIT (say to oracle.reg), copy this file to the new machine and import.