An sd9 file extension is related to the XWE and used for its data files.
Software that open sd9 file
SD9 file extension - XWE data
What is sd9 file? How to open sd9 files?
File type specification:
The sd9 file extension is associated with the XWE, a (also known as eXtendable Wad Editor) software tool for Microsoft Windows operating system that allows users to edit Doom *.wad files.
The sd9 file contains some kind of data used by XWE.
The default software associated to open sd9 file:
XWE allows users to view and edit sprites, textures, flats, sounds, SOCs, level headers, and any other type of lump included in WAD file.
List of recommended software applications associated to the .sd9 file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open sd9 file, edit sd9 file, convert sd9 file, view sd9 file, play sd9 file etc. (if exist software for corresponding action in File-Extensions.org's database).
Unspecified and all other actions for computer programs working with sd9 file - XWE data
Click on the software link for more information about XWE. XWE uses sd9 file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).