hi Jacqueline,
When I opened the file that you had attached via Audacity, it showed Mono, 44100 Hz and 32-bit.
Before exporting your file via Audacity, select the downward-pointing arrow next to the file name, select “Set Sample Format” and then select 16-bit PCM.
See screenshot attached [pdf].
The new file [“clock-16bit.wav” attached] worked when I used it in the DirectRT sample “dichotic.csv”.