Rsd extension is associated with RealSQLDatabase File. You have chance to open rsd files with REALbasic software.
Rsd extension stands for database file. These database files used with REALbasic programming language. You can try to install database files in basic software with this command:
myDB.databaseFile = GetFolderItem("mydb.rsd")
If you need, you can get detailed information about Realbasic software from its official web page in link below.
What to use rsd
which page related to rsd file
rsd Related Searches
You can check related links about rsd fileextension.