QUICK ANSWERStart with the tool that matches your immediate input.
Open Duplicate File Finder first when its stated purpose matches the result you need now. Use Remove Duplicate CSV Rows only when it solves a separate next task.
This guide is for writers, office teams, students, and data workers. Start with Duplicate File Finder when your immediate task is to use the Duplicate File Finder to complete this file task privately in your browser. Move to Remove Duplicate CSV Rows only when you also need to use the Remove Duplicate CSV Rows to complete this file task privately in your browser.
The goal is not to run two tools automatically. It is to finish the first narrow task, inspect its result, and then decide whether Remove Duplicate CSV Rows solves a genuinely different next step.
Both tools sit in Documents & Files, but they handle different inputs or outcomes. Keeping those roles separate reduces repeated work and makes verification easier.