Hey everyone, I was moving plans from my laptop to my PC and the files got corrupted along the way. Prior to knowing they were corrupted I erased them off of my laptop. I was able to recover the files from the hard drive but I get the following error when trying to open the .plan files.  [Unable to read the file "file name here" This file does not have a valid header record.]   Has anyone ran across this before and have a way to revive these files? If not I have lost hours of work