Hello, People, I am getting more and more familiar with Wihu, but now i encountered a problem i cannot explain. Please review the following: Wihu is called from Winnt.sif/guirunonce. Install.ini has some lines description.3=Codecs command.3=cmd /c %systemdrive%\install\codecs.cmd selected.3 = 1 Codecs.cmd looks like: set dir=%systemdrive%\install rundll32.exe setupapi,InstallHinfSection DefaultInstall 132 %dir%\mp3\fhg.inf Fhg.inf is looking like this: [Version] Signature = "$Chicago$" AdvancedINF = 2.5, "Your setup subsystem is outdated. Please install IE 3.01 or greater." [DefaultInstall] RequiredEngine=Setupapi CopyFiles = CopyFiles.DLL, CopyINF RegisterOCXs = OCX.Register AddReg = AddReg [DestinationDirs] CopyFiles.DLL = 11 CopyINF = 17 [AddReg] HKLM, "SOFTWARE\Microsoft\Windows NT\CurrentVersion\drivers.desc", "l3codecp.acm",, "Fraunhofer IIS MPEG Layer-3 Codec (Professional)" HKLM, "SOFTWARE\Microsoft\Windows NT\CurrentVersion\drivers32", "msacm.l3codec",, "l3codecp.acm" [OCX.Register] "%11%\l3codecp.acm" [CopyFiles.DLL] l3codecp.acm,,,97 [CopyINF] fhg.inf Now there's a significant difference in the behaviour of the Inf-File: In manual installation (right click -> install) it all works well. Wenn called from wihu, everything in the '%systemdrive%\install'-Directory gets deleted. What is happening here ?