When using Twain components, the Twain 2.0 or later data source manager (TWAINDSM.dll) will be loaded by default. When using Citrix scanner redirection, it might be necessary to use the Twain 1.9 or older data source manager (twain_32.dll), if the scanner does not support the 2.0 or later data source manager.
The InitExt function can be used instead of the Init function to specify the Twain data source manager DLL name. Alternatively, the name of the data source manager DLL can be also specified in the BiTwain.ini file. The BiTwain.ini should be in the same directory as BiTwain.dll. The name of the data source manager can be specified in the “Twain DLL Name” key of the [Twain] INI file section:
[Twain]
Twain DLL Name=TWAINDSM.dll
For using Twain 1.9 on Citrix, the recommended setting is the following:
[Twain]
Twain DLL Name=twain_32.dll