IIS6.0 can support both 32-bit and 64-bit modes

IIS 6.0 can support both 32-bit and 64-bit modes. However,IIS 6.0 does not support running both modes on a 64-bit version of Windows . The ASP. NET 1.1 runs in 32-bit mode only. The ASP. NET 2.0 can run in either 32-bit or 64-bit mode. Therefore, if you want to run both ASP. NET 1.1 and ASP. NET 2.0, you must run IIS in 32-bit mode.

To switch between different versions of ASP, visit the following Microsoft Developer Network (MSDN) Web site to download and install ASP. NET 1.1 and ASP. 2.0:
Http://msdn.microsoft.com/netframework/downloads/updates/default.aspx

For example, if you are running Microsoft Windows x64 Edition, download the following two redistributable packages:

.net Framework Version 2.0 redistributable Package x64 (64-bit)
.net Framework Version 1.1 Redistributable Package
After you install the redistributable package, you can switch between different versions of ASP. To do this, you should complete the following steps for each asp:
ASP. NET 1.1, 32-bit version to run the 32-bit version of ASP. 1.1, follow these steps:

1. Click Start, click Run, type cmd, and then click OK.
2. Type the following command to enable 32-bit mode:

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3. Type the following command to install the ASP. NET 1.1 version and install the script map in the IIS root directory:

%systemroot%\microsoft.net\framework\v1. 1.4322\aspnet_regiis.exe-i

4 Make sure that the status of the ASP. NET version 1.1.4322 is set to allow in the Web service Extensions list in Internet Information Services Manager.

ASP. NET 2.0, 32-bit version to run the 32-bit version of ASP. 2.0, follow these steps:

1. Click Start, click Run, type cmd, and then click OK.
2. Type the following command to enable 32-bit mode:

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3. Type the following command to install the ASP. NET 2.0 (32-bit) version and install the script map in the IIS root directory:

%systemroot%\microsoft.net\framework\v2. 0.40607

4. ensure that the ASP. NET version 2.0.40607 in the list of Web service extensions for Internet Information Services Manager (

The status of the bits) is set to allow.

ASP. NET 2.0, 64-bit version to run the 64-bit version of ASP. 2.0, follow these steps:

1. Click Start, click Run, type cmd, and then click OK.
2. Type the following command to disable the 32-bit mode:

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3 . Type the following command to install the ASP. NET 2.0 version and the IIS

Install script mappings under the root directory:

%systemroot%\microsoft.net\framework64\v2. 0.40607\aspnet_regiis.exe-i

4 Make sure that the status of the ASP. NET version 2.0.40607 is set to allow in the Web service Extensions list in Internet Information Services Manager.

Reference Address:http://www.cnblogs.com/szytwo/archive/2012/10/12/2721931.html

IIS6.0 can support both 32-bit and 64-bit modes