The dproj file is the old project file extension from earlier versions of the software (pre-iCDB), Because PADS changed to this version later than Xpedition and didn't use the same naming conventions, PADS 2007 uses DxDesigner 2005 and it creates/uses the dproj file. Later versions of PADS switched to what was then known as the DxDesigner 2007 versions (iCDB) and used the prj file. You should create a dummy dproj file using a text editor, simply paste those two lines into it and save it as 'some file name'.dproj.
Then open this file from xDX Designer in VX.1.2.
If you can't make progress contact your local support organisation for assistance.