Open File Explorer
Click the View menu
Select Show
Turn on Hidden items
Open the folder containing the hidden files
If needed, open Folder Options
Go to the View tab
Select Show hidden files, folders, and drives
Click Apply
Click OK
On macOS, open Finder
Press Command + Shift + .
To unhide a file on Windows, right-click the file
Select Properties
Uncheck Hidden
Click Apply
Click OK
To unhide a file on macOS, use Terminal
Enter chflags nohidden followed by the file path
Press Return