Solution : https://service.sap.com/sap/support/notes/94801 (SAP Service marketplace login required)
Key words :
\data\prod\sapdata1 additional environment variables, hkey_local_machine->software->oracle->home0, symptom setting environment variables, sapdba -check/analyze logs, database instance system id, sap system id, database data files, prerequisites sap release 4, profile init<dbsid>, %sapdata_home%\saptrace sapdata1
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