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This format is further described in the manufacturer's documentation.
The Teledyne-RDI software to read RDI files (winADCP) is available through their website, although it is not obvious how to download. There are also some questionable sites offering downloads that don't go anywhere except to potential malware. Users can request access through the Teledyne Marine Download Portal: https://tm-portal.force.com/TMsoftwareportal/s/ As always you can contact us for support, through the main website, on Oceans 3.0 or here: Contact Support.
Example: RDIADCP75WH17432_20131113T000000.000Z.rdi
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