The ds3 file extension is associated with the WinDS PRO, an emulator of Nintendo, Nintendo 64, Nintendo DS etc. for Microsoft Windows operating system.
The ds3 file stores some kind of data used by WinDS PRO.
How to open:
The ds3 files are used for internal purposes of WinDS PRO.
How to convert:
As far as we know, this .ds3 file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.