When you HotSync all of the AltAcc datafiles stored by ProRead are saved to a file on your PC named ProReadDB.PDB. ProExt is a utility that reads the files from this PalmPilot database and saves all of the AltAcc flight data files it contains to disk. The link below points to a ZIP file that contains the executable and the source code.
You may find that this is more convenient than transfering multiple files from the PalmPilot using the Send function. ProExt formulates a DOS filename from the name given to the flight data in ProRead. It drops non-alphanumeric characters and added a file extension of .DAT. If the file of the same name exists in the current directory when you run ProExt it will be overwritten so use caution.