On the C drive, "C:\Windows\System32\oobe\info\background" the Win7 startup animation is the ball spinning, which is stored in the X:\windows\system32\bootres.dll file. Resource name: RCData - activity.bmp file. activity.bmp is composed of 105 pictures of 200px*200px, with a total size of 200px*21000px, and a small size of 12M. The startup animation is to play these small pictures in sequence (loop after the 60th picture) Back up bootres.dll, because if the modification fails, it will become a Vista-style scroll bar. Use Flash/3ds/other animation production software to create a 105-frame animation and export it as a sequence of 105 200px*200pz pictures. Then use the picture editing and synthesis tool to merge it into a 200px*21000px picture file. Create a new folder and save it named: activity.bmp, as shown in the picture: Only one file, activity.bmp, must be saved in this new folder, because wimtool will be used next. Packaging, and wimtool is based on folders.

Open wimtool, select new and append, maximum compression, volume name: Boot Resource, add a boot mark to the volume, and start making the old and new versions of wimtool production diagram: run ResScope to open bootres.dll, select RCData-1 to replace the resource, and select the one you just made wim file, save it (if you are prompted that you do not have permission to modify OOXX or the like, you must first obtain administrator permissions, so there is no need to talk about this). Copy the digital signature toolkit file to X:\windows\system32\ and run cmd->cd x:\windows\system32regsvr32 /s capicom.dlleditbin /release bootres.dll (to sign) makecert -r -ss my -n "CN=my test ca" (to make a temporary certificate) signtool sign -s my -n "my test ca" bootres.dll (signature) bcdedit /set {current} testsigning on (allow test signing) and then restart to see the effect