Sorry, but I think we need a lot more information about how you recorded your material and then what you did to it when it became unplayable. What sort of audio interface did you use? What are the full details of the settings you used to record: bit depth (16 bit?), sample rate, the type of file you saved to (.wav .aif or something else), that sort of thing?
FYI, Audition can convert most file types and sample rates/bit depths as required. Similarly, there's no reason PCs can't work in 32 bit floating point--it's just down to the software you choose to do it. However, if you have to end up in 16 bit for your uploader you may as well stick to that.