I've never encountered any form of MP3 player that it isn't 'plug & play'. (i.e. no driver is actually required). They might occasionally come with software which, among other things, can be used to transfer files to and from a PC (just as digital cameras often do) but that doesn't prevent them showing up as an external drive when connected to a PC's USB port.
Have you tried simply plugging the device into an MP3 port, waiting for a while until it's detected (which can take up to a minute or two in some cases) and then exploring its contents using Windows Explorer? If you can access the files that way you can then copy-&-paste (or drag-&-drop) them into your chosen location on your PC.