I need to rename 12,000 TIF files located in various folders (all under one main folder) so that instead of having a numeric name (01234.TIF) they will have a name that makes sense. The existing file name (including full path) is in one column of the spreadsheet and the new file name is in another, but it does not contain the path or file extension. Included in the folders are files that do not need to be renamed (e.g. they may be Word docs, or some other type that has a good file name already). The spreadsheet contains the file names of all the documents (28,000). Thank you for any help you can give with this problem!