Change directory before starting the application

Is there any possibility to change directory (application specific directory) before launching the application?

I'm writing a launcher for an application already installed on the system in use. As I often have to change the settings (a lot of registry values) I exported them as set to files and would like to import them and then start the application automatically. So my PortableApp is not a real portable one, it's just a tool helping me to manage the different configurations.

This ... application doesn't start properly if the current directory is not set to the appropriate subfolder in %programfiles%

In a batch file I would just write

cd "%programfiles%\appldir"
"%programfiles%\appldir\appl.exe"

Is it possible to script this in NSIS?