Files with spd file extension are related to the Apache OpenOffice presentation format, used by older versions of OpenOffice Impress.
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.SDP file extension - Apache OpenOffice presentation
What is sdp file? How to open sdp files?
The sdp file extension is associated with the Apache OpenOffice, an office suite for various platforms, which enables users to create documents, spreadsheets, presentations.
The sdp file contains presentation from old versions of OpenOffice or StarOffice.
The default software associated to open sdp file:
Apache OpenOffice Impress (OpenOffice.org Impress) 
Company or developer:
OpenOffice.org Project Team
Apache OpenOffice Impress (OpenOffice.org Impress) is a powerful open-source presentation program, with which users can create professional looking presentations with many graphical effects. It is also compatible with Microsoft PowerPoint formats. Impress comes as part of OpenOffice.org productivity suite.
Company or developer:
The Document Foundation
LibreOffice Impress is a complete multimedia presentation software that supports all modern presentation formats. It's an open source software that comes as an integral part of LibreOffice suite.
List of software applications associated to the .sdp 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 sdp file, edit sdp file, convert sdp file, view sdp file, play sdp file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting sdp files.
Software that open sdp file - Apache OpenOffice presentation
Programs supporting the exension sdp on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open sdp file action.
Microsoft Windows:
StarOffice (obsolete/discontinued)
Multiplatform:
Main software associated with sdp file by default:
Apache OpenOffice Impress (OpenOffice.org Impress)
LibreOffice Impress
