Question: how to associate tsv with excel windows 10?
Answer: Find a TSV file on your computer.
Right click on the TSV file and select “Open with…” (and if a menu appears, select “choose and app”)
Check the box to “Always use this app to open .tsv files”
Select Excel in the list of apps at the top of the dialog, or browse for Excel if it's not listed there.
Click OK.