Pysimplegui: [ Question] Use custom image for FileBrowse/FolderBrowse?

I assume you mean to use an image on the button? It's not an icon in that case, it's a button image

As a work-around, you can create your own File browse button with an image by copying the code for FileBrowse and adding the image (either filename or data) to the Button call.

Here's the FileBrowse code

def FileBrowse(button_text='Browse', target=(ThisRow, -1), file_types=(("ALL Files", "*.*"),), initial_folder=None,
               tooltip=None, size=(None, None), auto_size_button=None, button_color=None, change_submits=False,
               enable_events=False, font=None, disabled=False,
               pad=None, key=None, k=None, metadata=None):
    """

    :param button_text: text in the button (Default value = 'Browse')
    :type button_text: (str)
    :param target: key or (row,col) target for the button (Default value = (ThisRow, -1))
    :param file_types: filter file types (Default value = (("ALL Files", "*.*")))
    :type file_types: Tuple[Tuple[str, str], ...]
    :param initial_folder:  starting path for folders and files
    :param tooltip: text, that will appear when mouse hovers over the element
    :type tooltip: (str)
    :param size:  (w,h) w=characters-wide, h=rows-high
    :type size: (int, int)
    :param auto_size_button:  True if button size is determined by button text
    :type auto_size_button: (bool)
    :param button_color: button color (foreground, background)
    :type button_color: Tuple[str, str] or str
    :param change_submits: If True, pressing Enter key submits window (Default = False)
    :type change_submits: (bool)
    :param enable_events: Turns on the element specific events.(Default = False)
    :type enable_events: (bool)
    :param font: specifies the font family, size, etc
    :type font: Union[str, Tuple[str, int]]
    :param disabled: set disable state for element (Default = False)
    :type disabled: (bool)
    :param pad: Amount of padding to put around element in pixels (left/right, top/bottom)
    :type pad: (int, int) or ((int, int),(int,int)) or (int,(int,int)) or  ((int, int),int)
    :param key: key for uniquely identify this element (for window.FindElement)
    :type key: Union[str, int, tuple, object]
    :param k: Same as the Key. You can use either k or key. Which ever is set will be used.
    :type k: Union[str, int, tuple, object]
    :return: returns a button
    :rtype: (Button)
    """
    return Button(button_text=button_text, button_type=BUTTON_TYPE_BROWSE_FILE, target=target, file_types=file_types,
                  initial_folder=initial_folder, tooltip=tooltip, size=size, auto_size_button=auto_size_button,
                  change_submits=change_submits, enable_events=enable_events, disabled=disabled,
                  button_color=button_color, font=font, pad=pad, key=key, k=k, metadata=metadata)

Yes, I mean an image. I'll use that, thank you very much.

The only thing you really need to add to your button call is the button_type. That's what will control if it does a file browse, etc.

And maybe a couple of the parameters that have default values (file types for example)