What you say is the Non-English field mod used in Links 2.0.
In Links SQL works differently. Full_Name field can contain almost any character, since it's the name of the category.
Until it contains just English chars & valid chars, the directories are based on Full_Name. Otherwise you have to use build_directory_field.

So why we need to use Full_Name:
1) Links SQL imports the Category field from Links 2.0 into Full_Name
2) The build_directory_field is exactly created for the task to contain valid directory paths
3) internally Full_Name is the main field in Links SQL, some tags are based on this field, like category_name_escaped or category_name. They are derived from Full_Name.
See the code in Links/Build.pm:

I hope this answers your question.

Best regards,
Webmaster33

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