Hi Alex, that EML files are likely from Outlook and would probably require an app that could open EML mail files. Off the top of my head I don't know one. There is a specific EML reader app that you can find (here)
As for the RTF files, that depends on what word processor you have installed. I know Quick Office can open RTF files. If you have more than one word processing app installed, it would ask what app you want to use to open the file. There also is an RTF specific reader app, (here)