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Func _ChangeWallpaper($sFile,$iType)
 ; Changes the wallpaper to $sFilename using $iType as:
 ; 1 Tiled
 ; 2 Centered
 ; 3 Stretched
 ; any other value (usually 0) unchanged
 ;
 ; Returns
 ; 0 if everything is allright.
 ; -1 if $sFile does not exist. @error is set to 1
 ; -2 if £sFile is not a .bmp file. @error is set to 2
  
  If Not FileExists($sFile) Then
     SetError(1)
     Return -1
  EndIf
  If StringTrimLeft($sFile,StringInStr($sFile,'.',0,-1)) <> 'bmp' Then
     SetError(2)
     Return -2
  EndIf
  
  Select
  Case $iType = 1
     RegWrite('HKCU\Control Panel\Desktop','TileWallpaper','reg_sz','1')
     RegWrite('HKCU\Control Panel\Desktop','WallpaperStyle','reg_sz','0')
  Case $iType = 2
     RegWrite('HKCU\Control Panel\Desktop','TileWallpaper','reg_sz','0')
     RegWrite('HKCU\Control Panel\Desktop','WallpaperStyle','reg_sz','0')
  Case $iType = 3
     RegWrite('HKCU\Control Panel\Desktop','TileWallpaper','reg_sz','0')
     RegWrite('HKCU\Control Panel\Desktop','WallpaperStyle','reg_sz','2')
  Case Else
   ;
  EndSelect
  
  RegWrite('HKCU\Control Panel\Desktop','Wallpaper','reg_sz',$sFile)
  DllCall("user32","int","SystemParametersInfo","int",20,"int",0,"str",$sFile,"int",0)
  
  Return 0
EndFunc