So .wav is the file format I have to achieve (from MP3) to use CDs on car and other players?
No not strictly true, tracks on a cd are CDA, C D Audio.
You don't have to do anything to the file be it mp3 or wav or wma nero converts it for you.
Have a look at the help in nero it tells you exactly what to do.....
for those that don't have nero and are interested, or can't be bothered to look here is the help file.
Burning audio files from your hard disk
If the audio files you wish to burn are already on your hard disk then you can skip this point and continue from point 2.
If the audio tracks you wish to burn are not on your hard disk, then
copy them first to your hard disk with Windows Explorer if they are WAV, MP3, VQF or other audio formats and you do not intend to convert them to another format, or
save the tracks to your hard disk if they are Audio CDs and the files are in CDA format or if you wish to compress audio files. The chapter 'Saving audio tracks' tells you how to do this.
Insert an empty CD-R into the CD recorder.
Start a new compilation by clicking on the appropriate button or the File menu and the command New.
Click the 'Audio CD' icon - the Audio CD tab is in front. Use the tabs to specify the attributes of the compilation, such as the name of the CD, different characteristics and restrictions.
On the CDA-Options tab you can select how Nero will handle CDA files that are on a Music CD – this tab is irrelevant for burning files that are on a hard disk however.
Once you have selected your settings, click the New button on the right. You will now see the empty compilation window for CD.
If a File Browser is not open yet you can open one by selecting New File Browser from the View menu or clicking the appropriate 'File Browser' icon. To specify that Nero is started with an open File Browser, check 'Start with File Browser' in the 'General' section on the File Browser tab (File -> Preferences).
Compile the files for the Wave files using Drag&Drop editing by simply clicking on the required files in the File Browser and dragging them into the compilation window.
Click on the Write CD button or select the Write CD command from the File menu to open the write dialog box. This option is only available when the compilation window is selected, as can be seen from the fact that the title bar is blue. If the File Browser is selected (and the title bar of the compilation window is therefore grayed) the option is not available and CD writing cannot be started. In this case click anywhere in the compilation window.
The 'Write CD' dialog box now opens - it is the same as when creating a new compilation but the Burn tab is now in front.
Important: Do not deactivate the 'Disc-at-once' checkbox. If the checkbox is not active the CD will be written in the 'Track-at-once' mode which may result in hiss and crackle between tracks.
Click the Burn button to start the burning process. All the selected steps now run in sequence until writing is complete. You can monitor progress in a status window which shows the individual steps being logged as they are executed.
A typical final message would be: 'Burn process was successful with 12x (1800 KB/s)'. The CD is then ejected. The messages shown can either be saved, printed or discarded. Close the window by clicking on the Discard or Close buttons.
You can now check what has been written to your new Audio CD by inserting it again and clicking the 'CD Info' icon.
Important: If your burned Audio CDs crackle, hum or hiss, you probably have problems with the so-called 'Audio Jitter Effect'. This is due to basic problems which the hardware has when reading audio data and has nothing to do with Nero.