@Hasso-Falisco
Suppose you have a file named FilesToFind.txt that contains:
filenameA
filenameB
filenameC
Open a command window in the directory you want to search. Then enter this command:
for /F %F in ('type FilesToFind.txt') do @dir /b %F
If you also want to search in sub-directories, use:
for /F %F in ('type FilesToFind.txt') do @dir /s /b %F
That will spit out a list of the files that exist, which you may be able to use effectively.