Does Audacity support 32-bit float audio files?
Yes you can both import and export 32-bit float audio files.
A bit more technical detail:
Audacity supports both importing and exporting “32-bit float PCM” audio files, such as “32-bit float WAV” or “32-bit float AIFF”.
(Some audio formats, such as FLAC, don’t support 32-bit float, and many compressed formats, such as MP3, don’t really have a defined bit-format.)