The .rdb file extension is most commonly associated with N64 ROM database files. These files contain a list of games created for Nintendo 64 emulation applications. The RDB files do not contain the actual game files themselves. They only contain a database of referenced N64 ROM game files.
The .rdb file extension is also used for Darkbot random database files, Gear CD suite files, Oracle database root files, Redis database files, TrueVector rules database files, Value Navigator database files and Roxio Retrospect backup set files.
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If you have additional information about the RDB file format or software that uses files with the RDB suffix, please do get in touch - we would love hearing from you.