Packed wavetable WAV
A packed wavetable WAV is a single audio file that stacks every frame of a wavetable end to end, so a wavetable-capable synth can import the whole table from one file.
An importer divides the audio into blocks of its expected frame size and maps them to table slots. If the length or frame size is wrong, it may read the frames incorrectly. Serum and Vital both accept packed WAV wavetables, though their import settings and limits differ.