Open SPM File
A file with the SPM extension is a package created by the Salt Package Manager (SPM).
About SPM Software
Salt Package Manager allows you to package Salt formulas to simplify distribution to Salt masters.
SPM's design was influenced by other existing software packaging systems, including RPM, Yum, and Pacman.
Function of the SPM file
It is basically a zipped folder that contains a collection of pillar and state files that make up a formula.
SPM files can be used for various purposes, such as configuring users or permissions, or configuring and starting a service.
To build an SPM package, the formula files must be organized in a folder of the system that is being built, followed by creating a file of type FORMULA, which stores metadata used by SPM, in the root of the package folder, and then run spm build, naming the folder.
Salt is a configuration management system used to keep remote nodes in defined states.
It can also be used as a distributed remote execution system to execute commands and fetch data on remote nodes.
It should be noted that a Salt master is a server that acts as a central control bus for the minions, which are clients.
SPM and Windows
As for Windows, there is the Windows Package Manager, which provides a software repository and a package manager similar to Linux, through yum and apt.
This allows you to do installations on Windows, remotely.
Software to open a SPM file
The SPM extension file is proprietary and should not be attempted to be opened with any software other than Salt Package Manager