The simplest way we can think of is to use MicroEditor to create a zero "sound" length SF file of the sample rate and channels that correspond to the wav files. You can do this by Right clicking the Record Icon and create the file with the right parameters and do not record into it. The file will have 1024 bytes in it.
Then use the Microsoft DOS copy command to append the wav file DATA ONLY to the SF "header" file. I believe the Microeditor manual discusses the length of the .wav file header. If I remember correctly, you will have to start copying from the .wav file AFTER the number of bytes in the header. If you are one byte off, your channels will be swapped, so be very careful.
This COPY operation will write a new file, so you can use the SF "header" file over and over. The DOS batch files support a FOR loop command that works with directories. Thus, it should be possible to write a batch file that does the WAV to SF conversion above for all wav files in a diretory.
Thus, xxx.wav could be converted as xxx.wav.sf. However, this assumes that all wav files are of the same sample rate and channels, or that the sample rate and channels can be determined by the file name in a way that the batch file can support. If not, move each different group of files to different directories, and create a SF header only file for each.
Once you have the 24-bit WAV files converted to SF files, you can mix and process them in Microeditor 5.3 or higher, staying in 24-bits throughout.
We are looking for example 10 second long 24-bit .wav files that we can analize and add 24-bit wav (Broadcast WAV?) support into Microeditor. 