Are you using back slashes or forward slashes in Node-RED on Windows to describe the file path? If using back slashes, you need to double them up (\\) since a back slash is taken as an escape character.
Otherwise, if you use Windows Explorer, can you see the files? Will Node-RED see the file after you've accessed it in Windows Explorer? You could also try using the \\ipaddress\path\to\file.xx format instead of relying on a drive letter.
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