I'm staying on Quicken 2013 Premier for Windows.
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.
If you need to convert to a newer version you might need to go through one or more intermediate versions. How to use an intermediate version to convert to a newer version
I had some links on moving your files between computers but they don't work any more. I'll have to find the new one. Maybe someone else will post it.