You need to open the .dproj file to convert the ascii schematics into the newer database formats. The files you are referencing, may or may not be schematic files, I can't tell without seeing the file in it's entirety. Schematic files should be in the \sch subdirectory.
To migrate teh file to the new format, ensure that the paths are still correct in Viewdraw.ini for the symbol libraries.
I cannot open the .dproj file. The error message says: "This project cannot be opened because it does not belong to supported flows".
I moved those schematic files from the \sch sub-directory to take a screenshot. So they must be schematic files. Not sure how to open or convert them though.