I know theres no CAD allowed in here but the Help, Tips and Tricks forum doesn't let me post a new thread.

Basically, ive got an e-mail that has 10 attatchments in the form of PLT files. How can I open them?????
Ive tried renaming them to DWG but doesn't work, and when i double click on the icon, autocad pops up and say darwing file invalid.

Is there any way i can opem them?????

Bob