SetProperties with Variable possible?

Hi there, is it possible to set properties with a variable?

Have a Screen with 4 Checkboxes. On preload it should check whether files exist and activate a box (1 file = 1 box).

Tryed this, but don´t work...

Code:

files = {"file1.exe","file2.exe","file3.exe","file4.exe"};
boxes = {"CTRL_CHECK_BOX_01", "CTRL_CHECK_BOX_02", "CTRL_CHECK_BOX_03", "CTRL_CHECK_BOX_04"};

    for j,k in pairs(files) do
        if File.DoesExist(k) then
            DlgCheckBox.SetProperties(boxes[j], {Enabled = true, Checked=true});
        else
            DlgCheckBox.SetProperties(boxes[j], {Enabled = false, Checked=false});
        end
    end

Code:

--This works, but is to long...

if File.DoesExist(files[1]) then
    DlgCheckBox.SetProperties(CTRL_CHECK_BOX_01, {Enabled = true, Checked=true});
else
    DlgCheckBox.SetProperties(CTRL_CHECK_BOX_01, {Enabled = false, Checked=false});
end

if File.DoesExist(files[2]) then
    DlgCheckBox.SetProperties(CTRL_CHECK_BOX_02, {Enabled = true, Checked=true});
else
    DlgCheckBox.SetProperties(CTRL_CHECK_BOX_02, {Enabled = false, Checked=false});
end

---...

Any other idea?