Open files choosing path in combobox and files in checkbox (user form)

Hello all,

PLease help me with the following problem. I have initial constant path "C:\Users\User1\Desktop\My files" having subfolders 2018, 2019, 2020 , each of them containing subfolders with week 01, 02, 03.

1) I need to find necessary folder on path consisting of "constant path + sub folder year + subfolder week" by choosing them in combobox (combobox1 - year, combobox2 - week)

2) in the found folder i need to open .xlsx files starting with letters A, B or C chosen by checkboxes.

Please help me to complete the code. Thank you so much!