Register 32 bit COM DLL to 64 bit Windows 7

Solution 1:

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.

Solution 2:

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

Solution 3:

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

Solution 4:

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 < filename >.dll

you can still take this exception. so IIS- pool Advanced settings, Enable 32 bit application : true ;)

Solution 5:

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

type regsvr32 dllname.dll to register .dll