This video will show you how to compare files and folders on Windows 10.
The software you will need download is winmerge, from ninite.com.
After the program installs, run it and hit the folder icon at the top.
It will ask for a right and left file/folder. Hit browse beside left, then choose the folder you want to compare. Then hit browse by right, and choose the second file/folder.
After you select the file, choose include subfolders at the bottom, and then hit ok on the right. Depending on the amount of files and their size it can take a little time to do the comparison.
Once it is done, you will see a list of all of the files in the folder that you chose to compare. If the files are text, and readable, then winmerge will tell you if the files are the same or not, and if they are different you can double click on the file and view the differences.
You can also see if files only exist in one of the folders, as the file will be listed as left or right only.
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