Because each entry has it's own template and fields, you should use different individual retrieve field values activities on each entry based on the template assigned within a conditional decision tree. You can find all 5 entries, and perform a for each entry, but inside this loop you should conditionalize the fact that your working with different data on each entry.

This is an interesting question Omar! I think it really depends on what information you have about your files. Do you know all of their names or IDs specifically? If so, it would be easy to find each entry and compare each one. It sounds like they have different templates, so you would need to know which template you are looking for with each file. 
If you are instead looking for all of the files in the folder, you could use a loop like you are now. But you would need to be looking for the same information across all files in the loop.