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Hi there. My name is ***** ***** welcome to JustAnswer.com.
What file are you trying to open in Dropbox?
These are the type of files that are supported on dropbox.
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Thank you for your time.
I am sorry, I just wanted to introduce myself but to also give you a place to start as I need to also know a little more detail on what type of file you are trying to open in dropbox.
If you would like I can chat with you through these posts or I can remotely connect to your mac and you can show me exactly what you are trying to open. Just Answer has a satisfaction guarantee therefore if you are not satisfied I can send a request to customer service for your refund.
Please let me know as I would like to help you with your issue.