What is the downside of using a .png file for the

问题:

This question already has an answer here:

• Is it possible to use .png images for WiX bitmaps 4 answers

I'm learning how to use WiX toolset to create an MSI file. The tutorial that I'm reading guides to using BMP files to customize the default dialogs. I tried here using a PNG file, and it seems to be working fine. Also, I found that using Bitmaps with transparency (which is not part of the original BMP specification) would work fine too.

<WixVariable Id="WixUIDialogBmp" Value="Assets\dialog.png" />

Is this a limitation of an older version of Microsoft Installer or Windows?

Here is the PNG file that I'm using.

Here is there installer running.

Note: I'm using Windows 10 with Windows Installer 5.0.16299.15.

回答1:

Yes, PNG support is "new" for Windows 8, per the MSDN SDK:

Windows 8 and Windows Server 2012: The image file can be in any standard format supported by the Windows Imaging Component (WIC), including TIFF, JPEG, PNG, GIF, BMP, and HDPhoto. The control does not support animation.

回答2:

I believe it's just a legacy limitation and the documentation was never updated. Probably technically falls in the unsupported category if you somehow ever needed to open a ticket with MSFT PSS.

I suspect under the hood MSI supports whatever native codecs are installed on the machine by WIC. YMMV may very on some old unpatched installation of XP or something. I wouldn't worry about it.

MSI UI is kinda old and crappy. If it does what you need then use it. Otherwise create a bootstrapper or external ui handler. One tip for transparency and nativeUI is to use pushbuttons instead of radio controls. Things like that will help. Look at what other installers do for examples.

https://msdn.microsoft.com/en-us/library/windows/desktop/ee719654(v=vs.85).aspx