Wave-file, the common binary format for PC audio. If the .wav-file has been written from WinMLS it contains the same header as the *.wmb-format. The scaling should be correct when the .wav-file is saved in WinMLS and reopened in WinMLS. However, since the format is 16-bits, the data are normalized to decrease loss in quality. Be aware of this if you plan to compare measurements in other programs than WinMLS.
Saving multi-channel .wav-file as a single file will restore the correct level in WinMLS only if calibration is turned off, since the calibration data is only present for channel 1. For details see Saving Defaults....
The data format is time domain raw data.