goldendict-ng/website/docs/howto/how to customize the opencc.md

Under the opencc folder ,these are the opencc configuration files.

the following three files are currently been used in GoldenDict.

s2tw.json
s2hk.json
t2s.json

• how to specify other configuration files?

1. create a custom file ,such as custom.txt

2. modify the *.json file, add add the new custom.txt to the configuration .

any other valid opencc configuration solutions should also work here.