Hi Bob, Thanks for your help.
Here's an extract from the script (the filenames are strange because this was originally reverse-engineered from a Visual Studio-generated installer). I've tried putting Assembly="no" or Assembly="Win32" in the file element, but that didn't help. Dave <Directory Id="TARGETDIR" Name="SourceDir"> <Component Id="C__9708E5D086A943D9A4AF8C00B98FE6C0" Guid="{F94EF4E5-7EB9-C9D5-3D50-31327DF46365}"> <Condition>SERVICEMMC=1</Condition> <File Id="_9708E5D086A943D9A4AF8C00B98FE6C0" Name="wsslink.exe" KeyPath="yes" Vital="yes" DiskId="1" Source="SourceDir\File\_9708E5D086A943D9A4AF8C00B98FE6C0" /> </Component> <Component Id="C__B9124A213D534DF5866BD82BA851FBA9" Guid="{460E1054-7182-0290-0F4D-552E8FBED012}"> <Condition>SERVICEMMC=1</Condition> <File Id="_B9124A213D534DF5866BD82BA851FBA9" Name="ExpoArgon.dll" KeyPath="yes" Vital="yes" SelfRegCost="0" DiskId="1" Source="SourceDir\File\_B9124A213D534DF5866BD82BA851FBA9" /> </Component> <Component Id="C__D099B4D7BAA640699B6080B3D1306A20" Guid="{E445D705-BDCE-897C-66DB-C51C8E5681F9}"> <Condition>SERVICEMMC=1</Condition> <File Id="_D099B4D7BAA640699B6080B3D1306A20" Name="WSSCallback.dll" KeyPath="yes" Vital="yes" SelfRegCost="0" DiskId="1" Source="SourceDir\File\_D099B4D7BAA640699B6080B3D1306A20" /> </Component> <Component Id="ATL71_Customer_Redist_____X86.3643236F_FC70_11D3_A536_0090278A1BB8" Guid="{55EB89C8-343D-4A52-8CEF-234DE6C4C5A1}"> <Condition>VersionNT</Condition> <File Id="FL_atl71_dll_4_____X86.3643236F_FC70_11D3_A536_0090278A1BB8" Name="atl71.dll" KeyPath="yes" DiskId="1" Source="SourceDir\File\FL_atl71_dll_4_____X86.3643236F_FC70_11D3_A536_009027 8A1BB8" /> </Component> <Directory Id="NEWPROPERTY1" SourceName="GFX Shared Components"> <Component Id="C__27B827D972C742C9ADCBCEDDAB39707F" Guid="{65D33B44-26B0-174F-89DB-519E7EC90A8D}" Permanent="yes"> <File Id="_27B827D972C742C9ADCBCEDDAB39707F" Name="Registrar.dll" KeyPath="yes" Vital="yes" SelfRegCost="0" DiskId="1" Source="SourceDir\File\_27B827D972C742C9ADCBCEDDAB39707F" /> </Component> <Component Id="C__4FC93A23614B46ADB944A14F3B3601F2" Guid="{85E338E3-E024-29B2-3356-8F3C9B8DD209}" Permanent="yes"> <File Id="_4FC93A23614B46ADB944A14F3B3601F2" Name="LSAPolicy.dll" KeyPath="yes" Vital="yes" SelfRegCost="0" DiskId="1" Source="SourceDir\File\_4FC93A23614B46ADB944A14F3B3601F2" /> </Component> <Component Id="C__97E442E3F5794519AF3060E53CA88AE2" Guid="{B9B90091-32ED-DCDA-3C0E-90B9E40AED16}" Permanent="yes"> <File Id="_97E442E3F5794519AF3060E53CA88AE2" Name="NTService.dll" KeyPath="yes" Vital="yes" SelfRegCost="0" DiskId="1" Source="SourceDir\File\_97E442E3F5794519AF3060E53CA88AE2" /> </Component> <Component Id="C__F335040B26E44099A1FF4F6464333669" Guid="{75855B57-C0B9-8530-6F66-A1C08F77A746}" Permanent="yes"> <File Id="_F335040B26E44099A1FF4F6464333669" Name="Logwrapper.dll" KeyPath="yes" Vital="yes" SelfRegCost="0" DiskId="1" Source="SourceDir\File\_F335040B26E44099A1FF4F6464333669" /> </Component> </Directory> <Directory Id="NEWPROPERTY2" SourceName="Snapins Folder"> <Component Id="C__4C3DCD351C4A41128A534CE23BFA4C04" Guid="{3916E3DC-8A29-74BC-1A22-49A8108642A8}"> <File Id="_4C3DCD351C4A41128A534CE23BFA4C04" Name="WSLSnapin.dll" KeyPath="yes" Vital="yes" SelfRegCost="0" DiskId="1" Source="SourceDir\File\_4C3DCD351C4A41128A534CE23BFA4C04" /> </Component> <Component Id="C__AC385F6CC4E741588A5D3B475118B290" Guid="{AF815FA8-A322-7A62-5F7F-233D2B0C61EB}" Permanent="yes"> <File Id="_AC385F6CC4E741588A5D3B475118B290" Name="LogView.dll" KeyPath="yes" Vital="yes" SelfRegCost="0" DiskId="1" Source="SourceDir\File\_AC385F6CC4E741588A5D3B475118B290" /> </Component> </Directory> <Directory Id="DesktopFolder" SourceName="User's Desktop" /> <Directory Id="ProgramMenuFolder" SourceName="User's Programs Menu" /> </Directory> Dave -----Original Message----- From: Bob Arnson [mailto:[EMAIL PROTECTED] Sent: 11 October 2006 17:45 To: BULL, Dave, GBM Cc: 'wix-users@lists.sourceforge.net' Subject: Re: [WiX-users] Please ensure this is a valid assembly file error: revisited BULL, Dave, GBM wrote: > If blah.dll is a .NET assembly then it works fine, but if it's a > regular DLL or even an empty file then I get the message. > What's your authoring look like? Light looks inside .NET assemblies to get version info but only if you marked the file as a .NET assembly. -- sig://boB http://bobs.org *********************************************************************************** The Royal Bank of Scotland plc. Registered in Scotland No 90312. Registered Office: 36 St Andrew Square, Edinburgh EH2 2YB. Authorised and regulated by the Financial Services Authority This e-mail message is confidential and for use by the addressee only. If the message is received by anyone other than the addressee, please return the message to the sender by replying to it and then delete the message from your computer. Internet e-mails are not necessarily secure. The Royal Bank of Scotland plc does not accept responsibility for changes made to this message after it was sent. 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