Oracle File Extensions

Does anybody here know the file extensions for an oracle database and it's log file?

IE:
Access = *.mdb
SQL Server = *.mdf | *.ldf
Oracle = *.??? | *.???

You're my last hope... I've asked this on three programming forums, googled it for about 15 minutes, asked everybody in my office, and even called two ex-employees. Nobody can answer this amazingly simple question. Truly 4chan has the answer right?

Probably, but it's not up to me. I'm developing software for a customer and they want the ability to choose what database they use. The three options are Access, SQL Server, and Oracle.

The problem is, I can't code the open file dialog box without knowing the proper Oracle file extensions and nobody will tell me THE FUCKING ANSWER.