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On a terminal server the GetWindowsDirectory/GetWinDir doesn’t return C:WINNT but instead a windows directory under the users account.
To get around this problem you can either copy the TWAIN files (twain.dll, twain_32.dll, twunk_16.exe and twunk_32.exe) to the above mentioned user “windows” directory and create a TWAIN_32 folder in the same for the data sources, or you can set a registry compatibility flag for you application to get GetWindowsDirectory to return the true Windows directory.
Refer to http://support.microsoft.com/default.aspx?scid=kb%3Ben-us%3B186499
In the registry folder:
HKEY_LOCAL_MACHINESoftwareMicrosoftWindows NTCurrentVersionTerminal ServerCompatibilityApplicationsAppname
set Flags (a reg_dword) to 408h if you application is 32 bit. The value 40Ch may be more appropriate, as this seems to be quite common for all the pre-existing keys. This last flag mean Win-32, Win-16 and return literal windows dir.
“Appname” above is your applications file name minus the “.exe” part.
A last note – this will most likely only work if the scanner is physically attached to the Terminal server’s (COM, LPT, SCSI or USB) port.