The JADE 2022 release meets tomorrow’s business demands.
The addition of an .ini option that takes a list of font paths, and calls gdi32.dll::AddFontResource for each provided font path, before the initial form is painted.
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In the interim, could you detect if you need to do the font install in your app's initialize method, and if it is needed do the call to install the font, then launch a new copy of your application via create external process, to pick up these font changes in the new jade.exe instance, and then terminate the original app?