I always use the HIVESFT.INF to apply themes I just add these lines replace xxxxx with your details HKLM,"SOFTWARE\Microsoft\Windows\CurrentVersion\Themes","CustomInstallTheme",0x00020000,"%Systemroot%\Resources\Themes\xxxxx.theme" HKCU,"Software\Microsoft\Windows\CurrentVersion\Themes\LastTheme","ThemeFile",0x00020000,"%Systemroot%\Resources\Themes\xxxxx.theme" HKCU,"Software\Microsoft\Windows\CurrentVersion\Themes\LastTheme","Wallpaper",0x00020000,"%SystemRoot%\web\wallpaper\xxxxx.jpg" i used this but nothing is changed. i am very sorry. why cant i do. my intention is that i have a logon file which name is energyblue.exe. i want to make default this.and i integrate theme files to uxpcd. i want to make one of them default. please help me