An sdr file extension is related to the QuickView Pro for DOS soundcard drivers. Probably obsolete.
SDR file extension - QuickView Pro for DOS soundcard driver
What is sdr file? How to open sdr files?
File type specification:
The sdr file extension is used for sound card drivers for MS-DOS system used by QuickView Pro.
Most likely some old format without support. No further information could be found.
This sdr 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.
The default software associated to open sdr file:
QuickView is DOS Multimedia Viewer with support for DivX, AVI, MPEG, MOV and MP3.
List of recommended software applications associated to the .sdr 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 sdr file, edit sdr file, convert sdr file, view sdr file, play sdr file etc. (if exist software for corresponding action in File-Extensions.org's database).
Unspecified and all other actions for computer programs working with sdr file - QuickView Pro for DOS soundcard driver
Click on the software link for more information about QuickView. QuickView uses sdr 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.).