The QDD file extension is primarily associated with two different file types: Quest Compiled Databases, used by Quest Software's application development, and Quartus II Design files, used in programming for Field-Programmable Gate Arrays (FPGAs) and Complex Programmable Logic Devices (CPLDs). Here we'll examine each of these in turn, detailing their connection to the QDD file extension, how these files can be opened, and useful software related to each type.
Quest Compiled Database Files
The QDD file type is primarily known to be associated with Quest Software, a comprehensive software application development system. These QDD files are typically considered Quest Compiled Database Files.
Files with the QDD extension are compiled database files created by Quest Software�s SQL Optimizer. These are not typically opened manually by users. Instead, they are automatically read and utilized by SQL Optimizer when needed. However, if you have a need to manually examine the content of a QDD file, it can be accomplished using Quest Software's SQL Optimizer.
Quartus II Design Files
The association of QDD files to Quartus isn't as common as the Quest Compiled Database files but it's significant especially in the field of programming. Quartus II is a software product developed by Altera Corporation for designing digital circuits and creating apps for Field-Programmable Gate Arrays (FPGAs) and Complex Programmable Logic Devices (CPLDs). A QDD file in this sense is a device design file containing data for these compiled digital design. You can download Altera Quartus II to open and work with these files.
QDD File Important Information
Remember, not all files with a .qdd extension will be readable if they are not used for the intended software (either SQL Optimizer for Quest Compiled Databases files or Quartus II for Quartus II Design files). Be careful not to rename the extension on .qdd files, or any other files. This will not change the file type. Only special conversion software can change a file from one file type to another.
In essence, the worth of understanding file types such as QDD lies in avoiding problems with incompatible file formats while trying to open a file. The more you know about the file types your software works with, the easier you can troubleshoot issues and ensure your data is organized and utilized effectively.