How do I use a 32-bit ODBC driver on 64-bit Server 2008 when the installer doesn t create a standard DSN

Question

I ran into an issue with some third party software that we use to track software license usage in our computer labs   We recently migrated the app to 64-bit Server 2008 after receiving assurances from the company that it was compatible and running some preliminary tests that showed that the app worked in the 64-bit environment   Unfortunately the person doing the testing didn t test the functionality of a couple of apps that I have that rely on accessing the data to do both live- and post-processing on the data to produce some reports   Turns out that the application doesn t have a 64-bit ODBC driver to access its internal data and can t use a 64-bit SQL Server ODBC driver to export its data to SQL server   It does include and install a 32-bit ODBC driver  but it installs it as a User Data Source  not a System Data Source  meaning that my windows service that runs the live collection isn t able to find it   I m also not able to create a System DSN since the Data Sources admin console can t find the installed driver   My question is how do I configure a data source for this connection that I can access from a C   NET windows service running under a system account   Since I ve figured out a way to do it  I ll provide my solution as an answer  in keeping with the FAQ on how to answer your own question    Similar to  What software exists for bridging a 64-bit ODBC app to a 32-bit ODBC driver on windows

User · Accepted Answer

It turns out that you can create 32-bit ODBC connections using C:\Windows\SysWOW64\odbcad32.exe. My solution was to create the 32-bit ODBC connection as a System DSN. This still didn't allow me to connect to it since .NET couldn't look it up. After significant and fruitless searching to find how to get the OdbcConnection class to look for the DSN in the right place, I stumbled upon a web site that suggested modifying the registry to solve a different problem.

I ended up creating the ODBC connection directly under HKLM\Software\ODBC. I looked in the SysWOW6432 key to find the parameters that were set up using the 32-bit version of the ODBC administration tool and recreated this in the standard location. I didn't add an entry for the driver, however, as that was not installed by the standard installer for the app either.

After creating the entry (by hand), I fired up my windows service and everything was happy.

User · Answer

A lot of these answers are pretty old  so I thought I would update with a solution that I think is helpful   Our issue was similar to OP s  we upgraded 32 bit XP machines to 64 bit windows 7 and our application software that uses a 32 bit ODBC driver stopped being able to write to our database     Turns out  there are two ODBC Data Source Managers  one for 32 bit and one for 64 bit   So I had to run the 32 bit version which is found in C  Windows SysWOW64 odbcad32 exe   Inside the ODBC Data Source Manager  I was able to go to the System DSN tab and Add my driver to the list using the Add button    You can check the Drivers tab to see a list of the drivers you can add  if your driver isn t in this list then you may need to install it    The next issue was the software that we ran was compiled to use  Any CPU    This would see the operating system was 64 bit  so it would look at the 64 bit ODBC Data Sources   So I had to force the program to compile as an x86 program  which then tells it to look at the 32 bit ODBC Data Sources   To set your program to x86  in Visual Studio go to your project properties and under the build tab at the top there is a platform drop down list  and choose x86   If you don t have the source code and can t compile the program as x86  you might be able to right click the program  exe and go to the compatibility tab and choose a compatibility that works for you   Once I had the drivers added and the program pointing to the right drivers  everything worked like it use to   Hopefully this helps anyone working with older software

User · Answer

Open IIS manager  select Application Pools  select the application pool you are using  click on Advanced Settings in the right-hand menu   Under General  set  Enable 32-Bit Applications  to  True

[.net] How do I use a 32-bit ODBC driver on 64-bit Server 2008 when the installer doesn't create a standard DSN?

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