File Path Validation

Hello,

I am writing a batch file to copy a load of files. I have a list of files with paths currently in Excel which have been extracted from a save file for a piece of software. Some of the paths were absolute and some were refferential so I have had to manually amend the paths to allow the copy to work. I am also not convinced that some of the files still exist so my question is simple. If I have a list of file path in either Excel or .txt is there anyway that I can validate the file path?

Thank you