Files with SPT extension might also be found as archives from Russian TM FilePacker program.
SPT file extension - TM FilePacker archive
What is spt file? How to open spt files?
File type specification:
The SPT file extension is also related to TM FilePacker a compression program for Microsoft Windows operating system developed by Russian developers called TMAgency. The .spt file stores achive created by the TM FilePacker.