Question:
Why do I not see my scanners on 64 bit systems? I am using the 64 bit Document Imaging SDK. I do not see my scanner listed in the TWAIN source window.

Answer:
The 64 bit Document Imaging TWAIN interface will only work with 64 bit TWAIN scanner drivers. Most scanners use 32 bit drivers on 64 bit system, and the 32 scanner drivers will not be listed in the 64 bit TWAIN source window. Please check your scanner if it has a 64 bit TWAIN interface or only a 32 bit interface.

The 64 bit Twain applications only work with a 64 bit Data Source Manager, and the 64 bit DSM only sees the 64 bit data sources.
The 64 bit DSM looks for the data sources in the %windir%\twain_64 directory. The 32 bit DSM looks for the data source in %windir%\twain_32. The data sources are .ds files, for example, datasource.ds. For more information, refer to the Twain DSM README.TXT file.

Regards,
Developer Support Team