Replacing a file into multiple folders/subdirectories

Probably there is one more (simpler) way.

Use the replace command:

replace C:\SourceFile.Txt C:\Some_Root_Folder_Which_Contains_Multiple_SubFolders /s

As the command itself says it just replaces the file, which already existed in sub-directories.

I'm not sure if I understood you completely. The following code will search for all occurences of 5.jpg in subfolders of C:\MyPath\ and replaces them with C:\NewImage\5.jpg. I did test it, so it should work.

FOR with parameter /R will help you here:

FOR /R C:\MyPath\ %%I IN (5.jpg) DO COPY /Y C:\NewImage\5.jpg %%~fI

If you want more information about what FOR /R does and what %%~fI means, have a look at FOR /? | more which gives nice explanations about the new Windows cmd possibilities that are used here.