Set Excel 2010 as default program when installed side-by-side with 2013

Title says it all. I recently installed 2013 side-by-side to 2010 and it has effectively 'taken over'. I want to 'opt in' for 2013 use and have 2010 be the default application for all known excel file extensions.

Multiple searches have rendered a regedit tweak to at least get Excel 2010 to show up as an available option after (right-click any excel file > Properties) > "Opens with: Change" > C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE. As stated, 2010 now shows up alongside 2013 as available programs to associate. Clicking 2010 DOES NOT constitute a system-wide change. All excel files regardless of extension continue to open in 2013.

For clarification, I successfully implemented the regedit hack and I have completed the above workflow for .csv, .xlsx, .xlsm, and .xls.

Also, my excel file icons are now a weird blend of 2013 and 2010.

Help appreciated.

Thanks,

The last version you install becomes the default version.

If you want 2010 to be the default version then you have to uninstall both versions then reinstall 2013 1st and 2010 last.