I can't export Wav 32 bits :(

Hello everyone!
I thought I was installed all the dependences, but when I try to export to wav 32 bits, I only have the 16 bits option. Please! Can you tell me if I have to install something else?
Thank you very much.

To export as 32 bit, select “Other uncompressed files” as the file format, then click on the “Options” button to select your required options.
More details in the manual: http://manual.audacityteam.org/o/man/file_export_dialog.html

Thank you very much for your answer!