Is there a way to change QGIS file browser default location? Currently it points to bin folder of QGIS installation C:\Program Files (x86)\QGIS Brighton\bin.
Any file selection dialog should remember the last location which was accessed. As far as I know, this works well for all dialogs in the QGIS core but it might not be the case for all plugins.
If you encounter a tool, with a file selection dialog which always defaults to a certain path, e.g. to bin, it would make sense to open a bug report on the (plugin) bug tracker to ask the developer to fix the behavior.