There may be enough here to warrent adding a System class.  Letting the user browse for a file, or pick a file path and name to save to are common taks for file I/O.  It would also be nice to be able to stop the program window from flashing when changing sizes (if it were made invisible first, then size and graphics could be added before it was made visible again).  A color dialog, access to the Printer, and a host of other tasks would fit nicely in a new System class.  For starters, here is a list I've come up with...

System Constants
    System Colors
    System Date format
    System Time format

System Devices
    Monitor Width
    Monitor Height
    Printer

Environment Variables
    Temp Folder
    Application Data Folder
    User Name
    ComSpec

User Dialogs
    OpenFileDialog
    SaveFileDialog
    ColorsDialog

Application Data
    Application path
    Icon
    Minimized/Maximize state
    Visible Property

External Applications
    CallExecutable (Shell)
    ShowDocument   (ShellExecute)