Do you mean open them so they can be edited?
If so simply open PowerPoint (not from the pps)
Click the big round Office button top left
Choose OPEN
Find the PPS and OK
Save as a PowerPoint presentation .ppt or .pptx
You can also
Right Click the pps and select NEW (This will open a copy not the original)
It is possible to simply rename the pps file to something .ppt but if you are a beginner I wouldn't go there.
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