This could be an old problem, still not solved yet in the latest beta version of wb (7.3.307). I'm using the English Windows 7 Ultimate with Simplified Chinese language pack, when trying to adjust fonts with downloaded skins, I cannot find any of Chinese fonts except the serif font SimSun-ExtB. This font however is not purposed for display, maybe for printout. Other non Simplified Chinese fonts, I have to say, are not so satisfied as the default Microsoft Yahei (msyh.ttf for normal and msyhbd.ttf for bolded) in Simplified Chinese. It's quite weird I can find Microsoft JhengHei (msjh.ttf) which is the default font for Traditional Chinese, and Meiryo (Meiryo.ttf) for Japanese, Malgun (malgun.ttf) for Korean. These fonts are all belong to Microsoft Sans-Serif Gothic series of fonts, (Segoe UI Family), also the  default interface typefaces for systems since Vista. (That means, on the other hand, it should be all right with Trad Chinese, Japanese and Korean users, I havn't tested this, but theoretically it should be.) Unfortunately, none of these can be replaced with each other. So are those fonts hidden or wb not support Simplified Chinese at all?