If there is no application on your computer which can open SPD files you need to search on the internet which application can open SPD files.įile extensions help computers locate correct application for specific files.This will either open it with matching application or Windows operating system will suggest you to look for an application for file extension SPD either on web or on local computer.To see if you have an application which supports SPD file format you need to double click on the file.Here is some information which will get you started. SPD file extension is used by operating systems to recognize files with content of type SPD. To open SPD file you need to find an application which works with that kind of file.