Open the XML file you'll see some text like
<font style="sans-serif" weight="normal">/tpa/preset/system/fonts/Sans-serif_Chinese_Reg.ccc</font>
Do you see it?You can change "Sans-serif_Chinese_Reg.ccc" to any name you want,like"MyFont" etc. and rename a TTF font file as "MyFont",then upload the XML and the TTF file to FS\tpa\preset\system\FONTS,use FAR or XS++




