Solved
The contents of the attachment doesn't match its file type.
Just to re-iterate, because it is getting VERY annoying.
Can you (PTC/Lithium) please solve this bug where the forum will not accept valid Mathcad and/or Prime files as attachments.
For further information, see here: https://community.ptc.com/t5/PTC-Mathcad-Questions/Survey-direct-Mathcad-files-attachments/m-p/476730#M172277.
Luc

