The DrvUnloadFontFile function informs a font driver that the specified font file is no longer needed.
Pointer to a driver-defined value that identifies the font file to be removed. The iFile parameter is the value returned by DrvLoadFontFile.
The return value is TRUE if the function is successful, and FALSE otherwise.
The driver should delete all scratch files, unload all DLLs that were loaded, and free all allocated system resources at this time.
This function is required for font drivers.
Build date: 12/16/2013