The best way to know the difference between the two files

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Winmerge

This tool shows the differences between two files (text only) away.
1) Start with WinMerge and then click on "File" -> "Open"
2) Select the two files you want to compare (left and right), and then click OK.
3) The difference, of course, would be as below:

Note:
If you use this program a lot and looked for an even faster way to do this, read ..
Perform the first WinMerge and click on "Edit" -> "Options".
Second click on the "Shell integration" on the left side, and see all three options for the image.
Thirdly, now when you compare two files, either want to ..
• Click Select the two files in Windows Explorer, right-click and click "Compare".
• or if the two files into the same folder, right click on the first file and click "Compare", then right-click the second file, and click "Compare".