Are those .pts files originated by a certain type of scanner proprietary?
Is that airborne lidar or mobile lidar data?
Since different scanners may have their own proprietary formats, they usually also have the capabilities to export to .LAS format. Check with the 'source' of the data and ask them to give you the data in the .LAS format
If export to .LAS is not available or inappropriate (if it is mobile data, then .LAS is not ideal although usage of it is not uncommon), there are other workarounds.