Thai script in estuary

In Windows.

I have thai subtitle fonts working perfectly but have a problem using Thai script in the estuary skin.

When I tried switching to Thai language, an add-on was installed but no Thai character was able to be displayed. Presumably because the standard Arial font does not support thai unless it’s the Unicode version.

The Thai font (garuda) that I use for subtitles is not available to estuary as a skin font, so am I supposed to install a Thai font for use by the skin?

If so, where should I put it?

Many thanks