Files that contain the .rsd file extension are normally associated with the RealSQLDatabase. The RSD file format that associated with this file type is a database file format that is used by the REALbasic software application.
The REALbasic software program is an application that is used to develop other software applications that use the BASIC programming language. These RSD files store the database information in a structured format. The information contained in the database can then be accessed using the various SQL commands.
The .rsd file extension is also used with Roland software program. These RSD files store sound files that are used by the application.
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If you have additional information about the RSD file format or software that uses files with the RSD suffix, please do get in touch - we would love hearing from you.