Clarification (I hope).
PTN files are backward compatible, MPW files are not.
For instance, if you download a scan in Designer 2.0X and first save it into a MPW file format to work on it, before converting it to a PTN, it will not be usable in 1.187.
Instead, first save it to a PTN, then edit it and avoid the MPW format.
Hope this is clear...
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