Files with sdu file extension can be typically encountered as some kind of data files for devices produced by Edwards Systems Technology.
SDU file extension - Edwards Systems Technology data
What is sdu file? How to open sdu files?
File type specification:
The sdu file extension seems to be mainly associated with the Edwards Systems Technology devices which are used for detection and alarming.
A typical .sdu file stores some kind of data used by devices developed by Edwards Systems Technology.
This sdu file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.