I was using an Olympus VN-960PC digital voice recorder, and was downloading recordings from that device to Windows XP via mini-USB cable. Unlike the Olympus VN-6200PC, the VN-960PC used the Digital Wave Player (DWP) program to download and display recordings. DWP showed the actual time and date when the recording was made. That information was not visible in Windows Explorer; WinEx would just show the date and time when the file was downloaded.
Someone had also created an Ubuntu command-line program to download files from the DVR. My search led to the discovery that this program, odvr, also had a GUI in its latest version.
Incidentally, in case anyone wonders, I was not able to get the VN-960PC to work directly with Ubuntu itself, nor with WinXP in an Ubuntu VM. In other words, I could run DWP in a VM to view the DW*.wav files that I had copied there, and I could run DWP in Ubuntu via Wine, but I could not get the hardware to work such that DWP would offer to transfer the files from the DVR to the computer. All I could get in the WinXP VM was a "usb device not recognized" error.