[roann]

For a lot of tasks TLH uses free third party command-line tools.

When creating/verifying ffp checksum files flac.exe is used. flac.exe is able to handle 24-bit files, so no problems here.

When creating/verifying st5 checksum files shntool.exe is used. shntool.exe in turn calls flac.exe for decoding the audio data. Though shntool.exe is able to handle 24-bit WAV files it is not able to handle lossless encoded 24-bit files. In other words: shntool.exe is not able to handle st5 checksums of 24-bit audio files if an external decoder is involved. That's why TLH gives you the "format of file ... is not supported" error message.

Note: FLAC fingerprint and st5 checksum of a FLAC file are always identical because both are simply the md5 checksum of the raw WAVE data of the audio file. So there's no need to create st5 checksums for FLAC files.