FLAC On A Mac

I downloaded Decibel, the trial version, and it worked fine with the FLAC files I downloaded from hdtracks. (Unlike the DVD-As I burned from those same files, but that's another story.)
I'm wondering if you downloaded 24-bit/192kHz files... The Marantz can only play back up to 24/96.

Achilles

The track I downloaded was a Reference Recording, Exotic Dances from the Opera, which is listed on the HDTracks site as 24 bit/96kHz.
The Marantz won't play it.
Shouldn't I be able to download a flac file on a mac as a flac file and then
copy it to a flash drive and still have it be a flac file? Or does passing through the mac environment corrupt the file? Keep in mind that I am not attempting to play the file from the Mac itself.

I agree, the file should remain a FLAC file when you transfer it from your Mac to a thumbdrive. So I don't understand why the Marantz won't play it.
You know, this is likely unrelated, but I just copied my hi rez Rush and Milos Karagdelic FLAC files from my Mac to a flash drive. I also copied some Apple Lossless files to the flash drive. I wanted to see if my car could play the FLAC files, as it has a USB port. It turned out it could not. I wasn't really expecting it to. It occurred to me later though that the FLAC files may not be to blame, as I have literally thousands of Kindle book files on the same thumb drive, so maybe the car stereo got overwhelmed looking for audio files. SO, maybe we should both make sure there's not a lot of extraneous junk on our thumbdrives? I don't expect the Camaro to play the FLAC, esp hi-rez FLAC, but I do expect the Marantz to, of course.

I downloaded Decibel and it it was easy to use and now I can play the files, but not on the Marantz.
The display in the Marantz seems to be telling me that it will output only 44.1 khz. The Marantz is on loan to me from a dealer. I suspect that it may need a firmware upgrade( which is not free) to output 96 khz but when I called the dealer they were clueless and unwilling to let me make the upgrade (they had to borrow the piece themselves from another store). The Marantz also isn't capable of Air Play without the upgrade, so I can't test that feature. This is a real problem, as I otherwise am not very impressed by this piece. It sounds very laid back and uninsightful, no match for the firewire DAC that I use with my Mac Book in my home theatre system or for my PS Audio Digital Link 3 that I use in my two channel system.
Re: your car: I suspect that the USB will only play mp3 files or the equivalent

I deleted all the eBooks and the car stereo still crashed when it atempted to read the thumb drive. Oh, well.
I can't think of anything else to get the Marantz to play the files, so I guess you should wash your hands of it and try another device.