SSIS packages can run in either x86 or x64 mode. It is a property of the package. It depends on how you are actually running the package as to where it is set.
- When developing the package you would set it in the properties for the project. It is
Run64BitRuntime. - If you are using SQL Agent then it is a property of the job when you set it up. Edit the job to specify which bitness you want.
- If you're using a batch file and running
dtexecdirectly then you need to pass a flag to have it run in x86 mode since SQL is x64 by default. - If you want to view the existing package details then use the SSIS node in SSMS. Alternatively you can use the catalog views to look using T-SQL.
My gut instinct is that you want your package to be x64 and therefore should ensure your Access runtime is x64. Then make sure your SSIS package is configured to run as x64 and not x86.