• Start it from Window/PointCloudTools/ShowHeaderDataHelper
• Assign your point cloud file into the PointCloud Source field
• Click "Read Header Data" - button
• See your console window for output:

Example output could be something like:
-20.485628 -12.712523 1.738634
-20.393023 -12.743558 1.745084
-20.432287 -12.628950 1.811702
-20.536118 -12.598611 1.791986
-20.533125 -12.783545 1.671434
-20.456675 -12.828678 1.665299
-20.584423 -12.689456 1.714009

(which helps you to see scale, point positions, and that this file doesn't contain colors, only X Y Z values)