Is it possible to use True Type fonts from different directory than C:/Windows/Fonts/ ?
Yes, the MS_FONTPATH configuration variable can be set to point to alternative directories which contain true type fonts.
MS_TTFPATH can also be used on older versions of MicroStation.
These variables will specify the paths to the directories which contain True Type fonts.
https://communities.bentley.com/products/microstation/w/microstation__wiki/8817/fonts-in-microstation
https://communities.bentley.com/products/microstation/w/microstation__wiki/14552/missing-font