Image File Names Getting Changed By Cs-Cart

Running 4.10.3 SP1. I have a naming convention for my image files that I don't want changed by CS-Cart but I find that dragging and dropping from my workstation into CS-Cart product does append an apparently generated string to my filenames. For example, I have a file named fire-engine-hookwork-pillow-01-DD0005P and when I drag it from my computer to the CS-Cart product page it gets renamed to fire-engine-hookwork-pillow-01-DD0005P_n69h-wo.jpg. Could this be due to the presence of a preexisting file on CS-Cart with the original name? How do I fix this behavior? Where can I take a look at the files on server. I know there is/was a file browser, but I can't find it.