The installer does not completely support high-contrast-mode

The installer does not completely support high-contrast mode, which is an accessiblity feature for people with eye disabilities.

How to reproduce:

1. Switch on the high-contrast-mode (e.g. <Left-Alt><Left+Shift><PrintScr>) or choose a high-contrast-theme/design - e.g. high-contrast-#1.
2. Start the installer and you'll get e.g. . At end of the installation you'll get e.g. . The concrete coloring depends on the used high-contrast-theme/design. And the worst is, that even white text on white background image is used, so that inverting a screenshot does not really tell, what text is in the dialog.

Could you please consider to confirm to the MSDN rules/guides about software with accessibility support like high-contrast? The installer may have a logo, but shouldn't have a background image like a watermark.

Thanks in advance!