I'm not sure what the default font(s) are for LRF files. I assume they would be the same as used for ePubs. The thing about LRF books is that they can come with embedded fonts, so I never really paid much attention to the default font(s) they use.
Some fonts have only a single file associated with them and I believe
Dutch801 Rm BT Roman might be one such font. For example, in my Windows/Fonts folder I have a font named
Arial Rounded MT Bold (version 1.0.0). If I right-click the font and open the properties menu I see that the file name is
arlrdbd.ttf.
However some fonts have multiple files associates with them. For example, if I double-click on the font
Times New Roman another folder is displayed showing four font styles each with it's own file, as follows:
- Times New Roman Bold: timesbd.ttf
- Times New Roman Bold Italic: timesbi.ttf
- Times New Roman Italic: timesi.ttf
- Times New Roman Regular: times.ttf
Whenever you replace the Sony standard font you have four styles for which you can substitute another font file. These are like those in the font
Times New Roman. The styles (style might not the correct terminolgy) are:
- Bold
- Bold Italic
- Italic
- Regular
So far each of these styles you can substitute a font file. Remember though that you don't have to substitute all four with the same font. You can use an Arial font file for Bold, a Segoe UI font file for Bold Italic, and so forth.