I don't know if is that what are you looking for, but try something like this:
1. Create a button
2. Add an action to run a macro
3. Create a macro like the one below:
Set shell = CreateObject("Shell.Application")
I hope this is gonna help you
Is this action going to take place only from the local client or also from the server?
For the local client you can also use the launch action to achieve the same effect:
- under application fill in explorer.exe.
- under parameters fill in the folder you want to open, for example ='C:\QlikView'
For the server I don't know what the best solution would be.