You should at least try to convert to the 2013 version since you don’t use any online services or download transactions now. Starting in 2014 they instituted an ID password to get into your own data. I went from 2004 to 2013. I'm staying on 2013.
2013 should run on Windows 10. You can download 2013 for free (I think it's the Deluxe version) using this how to convert article. It’s under Converting from Quicken 2004-2009.
https://www.quicken.com/support/how-and-when-use-intermediate-version-convert-older-versions-quicken
And FYI - If your Quicken was before 2010 you should have several files making up the data.
The main data file ends in .QDF. All Quicken versions prior to QW2010 store your data in a series of files all sharing the same filename but with different extensions like - .QDF .IDX, .QEL, .QPH and all 4 of those files were rolled into a single-file .QDF starting in 2010.
