Sometimes just saying the name of the file or folder that you want to highlight then saying "press enter" (after verifying that the appropriate file/folder is selected) will do the job in Windows Explorer. When that fails, try saying "press" followed by just the first letter of the file/folder name. This will highlight the very first entry which begins with that letter (this will be a lot easier if your Windows Explorer view is already alphabetized/sorted by name). If the first item is not the one you are looking for you can continue saying "press" followed by the first letter to continue highlighting, one after the other, each item whose name starts with that letter. Ultimately (if they are alphabetically sorted by name) you can say "move down" followed by the proper number to highlight the proper item before saying "press enter".
-------------------------
-Edgar
DPI 15.3, 64-bit Windows 10 Pro, OpenOffice & Office 365, Norton Security, Shure X2U XLR to USB mic adapter with Audio Technica DB135 vocal mic & Shokz OpenComm UC version 1 wireless headset, Asus X299-Deluxe Prime, Intel Core i9-7940X (14 core, 4.3 GHz overclocked to 4.9 GHz), G.SKILL TridentZ Series 64GB (4 x 16GB) DDR4 3333 (PC4 26600) F4-3333C16Q-64GTZ, NVIDIA GIGABYTE GeForce GTX 1060 GV-N1060G1 GAMING-6GD REV 2.0 6GB graphics card with 3 1920x1080 monitors