What is .SPX file extension?
System Information report created by the System Information application, which is included with OS X; contains information that describes the configuration of your Mac's hardware and software.
You can choose what information is contained in the SPX report when you save the file. Different kinds of information includes how much RAM is installed, networking features, number of USB ports, and connected Thunderbolt devices.
NOTE: The SPX file can be created by the System Information application or the system_profiler command in Terminal. Depending on the version of OS X, System Information may be called System Profiler.
You can see a list of software programs here on www.easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.