There have been some changes in the folder structure in Spotfire server 10.3. Two new folders as below have been added.
- "spotfire-bin" added under [Spotfire Server installation directory\tss\10.3.0\tomcat\spotfire-bin] 
- "spotfire-lib" added under [Spotfire Server installation directory\tss\10.3.0\tomcat\spotfire-lib] 

Changes in Spotfire version 10.x: What are the changes made to the folder structure in Spotfire 10.3?

All supported environments

"Spotfire Server installation directory\tss\10.3.0\tomcat\spotfire-bin" contains the following files.
=====
- config.bat
- kinit.bat
- klist.bat
- ktab.bat
- SetComputerPassword.vbs
- settoolenv.bat
- SetupWizard.vbs
- simple-config.txt
- simple-config-ldap.txt
- uiconfig.bat
=====

"Spotfire Server installation directory\tss\10.3.0\tomcat\spotfire-lib" contains the following files.
=====
- bcprov-jdk15on.jar
- commons-logging-1.0.4.jar
- cscommon.jar
- cscommon17.jar
- csjdbc.jar
- csjdbc7.jar
- DDJDBC64Auth05.dll
- DDJDBCAuth05.dll
- DDJDBCx64Auth05.dll
- httpclient-4.5.3.jar
- httpcore-4.3.1.jar
- postgresql-42.2.5.jar
- SfWinCon.dll
- spotfire-server-native.jar
- spotfire-tomcat-integration.jar
- sqljdbc_auth.dll
- sqljdbc4.jar
- TIdb2.jar
- TImysql.jar
=====

Note: Any third party JDBC driver that are used with Spotfire Information Services can be placed in either "Spotfire Server installation directory\tss\10.3.0\tomcat\custom-ext" folder  or "Spotfire Server installation directory\tss\10.3.0\tomcat\spotfire-lib"