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Two things come to mind:
1) As I understand it (however, this forum doesnt handle System.Data.OracleClient issues, its for Oracle's ODP) System.Data.OracleClient picks up the Oracle client (specifically oci.dll) based on your PATH environment variable
2) FORMS 6i is an 806 client as best I recall, so if System.Data.OracleClient is picking up the 806 OCI.dll, clearly it wants version 8.1.7 or higher
3) 10.2.0.1 Oracle client software had a known permissions issue that resulted in only administrative users being able to use the software. If System.Data.OracleClient is picking up 10201 oci.dll, that may be why. You should be able to find numerous posts on how to resolve that by googling for that error message.
In order to determine what is getting picked up, I'd recommend using a tool like [Process Monitor| http://sysinternals.com] to see which oci.dll is getting loaded.
Hope it helps,