Register 32 bit COM DLL to 64 bit Windows 7

Question

I have a 32 bit COM component DLL and this DLL is written in Delphi  It s a Win32 DLL  I want to use this DLL in my Visual C  project on  NET platform   I can t add reference to this DLL in the project  I try to register it in Command Prompt as Administrator in Windows 7 64 bit  but I get this error      Check if the module is compatible with an x86  32-bit  or x64  64-bit  version of regsvr32 exe    First I put DLL file to windows system32 folder  Then I open Command Prompt as Administrator  I write regsvr32 huginalpha dll and execute this command  But I get the error  what can I do

User · Answer

To register a comm  dll or  ocx on Windows 7 32-bit  do the following   Copy  dll or  ocx to c  windows system32 Type cmd in Run menu  it will search cmd exe  right click and click Run as Administrator  It will show a prompt at c  windows system32  Type   regsvr32 ocxname ocx to register  ocx  or  type regsvr32 dllname dll to register  dll

User · Answer

For 32 bit DLLS in Windows 64 bit platforms    Copy whatever dll to c  windows sysWOW64  Open a CMD prompt AS ADMINISTRATOR  very important    In the CMD window    CD c  windows sysWOW64  regsvr32 whatever dll   You will then be executing the 32-bit regsvr  c  windows sysWOW64 regsvr exe  on a 32 bit dll

User · Answer

If problem not resolved  when using SysWoW64 version of regsvr32  make sure all library dependencies have same archetecture  For example  when  regsvr32 lib x86 dll fails to register library  and    SystemRoot  SysWow64 regsvr32 lib x86 also fails  try to load lib x86 to Dependency Walker application to see whole list of dependencies  If any item have 64-bit archetecture  here is the reason  why regsvr32 fails to load 32-bit library

User · Answer

put the dll in system32 or syswow32 directory  and use appropriate regsvr32 to register it  wiered that even though it gave failed to register error  I rebooted my WIN 7 64 AND my vb app loaded the dll just fine

User · Answer

http   onerkaya blogspot com 2013 03 register-com-dll-on-windows-64-bit html  Retrieving the COM class factory for component with CLSID       failed due to the following error  80040154 Class not registered  Exception from HRESULT  0x80040154  REGDB E CLASSNOTREG     if you try this   c  windows system32 regsvr32 exe  lt  filename   dll  you can still take this exception  so IIS- pool Advanced settings  Enable 32 bit application   true

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I was getting the error  The module may compatible with this version of windows  for both version of RegSvr32  32 bit and 64 bit   I was trying to register a DLL that was built for XP  32 bit  in Server 2008 R2  x64  and none of the Regsr32 resolutions worked for me  However  registering the assembly in the appropriate  Net worked perfect for me  C  Windows Microsoft NET Framework v2 0 50727 RegAsm exe

User · Answer

Below link saved the day  https   msdn microsoft com en-us library ms229076 VS 80  aspx  use the relevant RegSvcs as specified in the above link  c  Windows Microsoft  NET Framework v4 0 30319 RegSvcs exe      Shared Your dll  tlb Your tlb

User · Answer

The problem is likely you try to register a 32-bit library with 64-bit version of regsvr32  See this KB article - you need to run regsvr32 from windows SysWOW64 for 32-bit libraries

User · Answer

Try to run it at Framework64   Example    32 bit  C  Windows Microsoft NET Framework v2 0 50727 RegAsm exe D  DemoIconOverlaySln Demo bin Debug HandleOverlayWarning AsmOverlayIconWarning dll  codebase   64 bit  C  Windows Microsoft NET Framework64 v2 0 50727 RegAsm exe D  DemoIconOverlaySln Demo bin Debug HandleOverlayWarning AsmOverlayIconWarning dll  codebase

User · Answer

I believe  things have changed now  On My Win 2008 R2 Box  I was able to register a 32 bit dll with a 64 bit regsvr32 as the 64 bit version can detect the target bitness and spawn a new 32 bit regsvr32 from  SYSWOW  folder   Refer  Registering a 32 bit DLL with 64 bit regsvr32

[dll] Register 32 bit COM DLL to 64 bit Windows 7

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