Bitrate question

[syed]

I have 002R with LE 7.3.1 running on MAC dual 2GHz PowerPC.

My brother uses Sonar. I wanted to get an Audio file from him and import into one of the songs I am working on. I was unable to import, because PT could not read it. He then gave me 3 versions of the same file, one 24-bit, one 16-bit, and the original, which is more than 24-bits. PT was able to import the 24-bit and 16-bit without any problem, but could not read the higher bit file.

My concern:

Is 32-bit or higher file better sounding than a 24-bit file?
How come Sonar is able to create higher bit files than PT? I thought PT is much much better in quality and technology than others out there.
Is Digidesign planning to come up with an updated version of PT LE which could work with higher bit rates? ( I know PT HD works at 48-bit).

Thank you
Syed