1- Open System Properties:

                  Press Windows + R, type sysdm.cpl, and press Enter.

                  Or: Right-click on This PC → Click Properties → Click Advanced system settings on the left.

 2- Go to Environment Variables:

                  In the System Properties window, click the Advanced tab.

                  Click the Environment Variables button at the bottom.

3- Add the Environment Variable:

               Under System variables (or User variables, if you want it set only for your user):

4- Click New...

                  Enter the Variable Details:

                        Variable name: JAVA_TOOL_OPTIONS

                        Variable value: -Dfile.encoding=UTF-8

                             Click OK.

5- Apply the Changes:

                  Click OK on the Environment Variables window.

                  Click OK on the System Properties window.

6- Restart TallyConnector if open