On Tuesday, May 16, 2017 at 5:14:45 PM UTC-6, Harry Potter wrote:
You seem to misunderstand: I want to change the picture Windows displays during startup and shut down.
The special made logo is compressed using a sekret method and stored in io.sys file. It's further animated in the moving bar across the bottom of the screen. Without knowing the compression technique used (and nobody will tell) or where it's at you CAN'T change it so very easy. There used to be instructions on how to make a similar animation bitmap on the web, but those sites are going to be hard to find in these latter days for 98.

So unless you buy the software that used to be able to do it, which is why those that knew how weren't telling how since they were selling the how, you just can't get there from here.

Shutdown is a separate issue and a different method. This one is simply named logow.sys and is found in the windows folder. Copy it somewhere else and change the extension to .bmp and view it with paint or any other image viewer.
Any replacement will have to be exactly same type, same size bitmap.