I have added one another utility to the other two posteds in this link:
Two utility for convert to .dat file
This converts the files .DAT ( D3 compatible) to .CSV and contrarily .CSV to .DAT
Read for use:
it selects to the left the type of file. DAT as example as source to be converted, and you make the search with " input file "
it selects to the right the type of file. CSV as example as file final convert, and you make the search with " Output file "
Click on " START " button
If everything all ok, you have the converted file saved in the same directory of the rising file.