Grammar question : Difference between these sentences.

Hi,

Can anyone tell me the exact difference between these sentences:

1. For selecting the new file, you need to open the desired folder.

2. For selecting the new file, you would need to open the desired folder.

3. For selecting the new file, you should open the desired folder.

4. For selecting the new file, you would have to open the desired folder.

5. For selecting the new file, you would need to have to open the desired folder.

What is the exact difference?

Please help me out.

Thanks in advance.