I noticed that lately, when I open a file in my local Dropbox folder, Dropbox opens a web page and then asks me what web app to use to open this file. This is totally unacceptable to me. I want to double-click my file and have my local app (Excel, Word, whatever) open the file.
I spoke with a very nice, very helpful representative via chat about this and I've discovered that there's no way to change this. Now I must right-click on my file and choose an app to open it. DropBox is listed as the default app and I must choose Excel to open the file.
So I will be moving my files from Dropbox to another online storage and sharing service. I've noticed that Dropbox has become more and more intrusive with ads and repeated suggestions about how to work and collaborate, asserting itself into all of my work with my apps stored and shared on Dropbox.