Applescript to read text file & set color of matching files in a folder

Question

I am keen to find a way to process a file I have been given for a string and to check if that string exists as part of a filename in a folder on my disk.
If the string in the file list corresponds to the file name in the folder then I want to color the corresponding file red.
Can anyone suggest a way to do this?

Answer 1

'I am keen to find a way to process a file I have been given for a string; - ? Is this to translate to - you have a file, containing multiple file names? And if so, are each file names on a separate line?
My above questions are derived from the statement portion of - 'If the string in the file list corresponds to the file name ...'.
Assuming such, here is some starter code:
property tFolder : (((path to desktop folder from user domain) as string) & "untitled folder 2:") -- Provided folder path.
on run -- Notify user to drag a file onto the applet.
display dialog "Drag file onto applet, for further processing." default button "OK"
end run
on open dItems -- Obtain a list of dragged-on items.
repeat with i in dItems -- Cycle through individual items
set fList to paragraphs of (read i)
repeat with j in fList
with timeout of 0 seconds -- Extend default timetout to infinity.
tell application "Finder" -- Activate 'Finder' for processing of desired folders' contents.
try -- Capture any unwanted AppleScript errors.
-- Obtain a list of all files with the name stored in 'fName'.
set tFiles to (every file of entire contents of folder tFolder whose displayed name contains j)
-- or, use the line of code below (in place of the line of code above), if the complete file name, including file extension, is within the dragged file.
-- set tFiles to (every file of entire contents of folder tFolder whose displayed name is fName)
if ((count tFiles) > 0) then -- If one or file exists, proess the file(s).
repeat with k in tFiles -- Cycle through the list of located files.
set (label index of k) to 2 -- Set the 'label index' of located file to 'red'.
end repeat
end if
end try
end tell
end timeout
end repeat
end repeat
end open
Save the above code as an application.