Roger Wilco is a Bulgarian fantasy gamebook writer who published exactly two books sometime around 1998. He was inspired by the more famous writer Michael Mindcrime, who he met on a tram. However, he started with the other book and ended with this one, and there’s no trace of other creations 26 years later. A Bulgarian version of Harper Lee.
I received a beautiful and well-preserved copy of True Macic by mail and it invited me to read it.

The book is short and readable, about 260 episodes. A junior mage and his anti-mage friend go after a magic book and a disk. The issue is that as it seems, there are lots of books of various colors, and the disks are likely CD-ROMs. They will find thousands. Judging by the book + CD-ROM-combo, I think the mission was to find one of those programming books from the 1990s with a CD glued inside.
The world is a post-apocalyptic fantasy where the current civilization has been transformed by a nuclear (or asteroid) holocaust. It remains unclear which one. The cities are in a mad-max-style chaos, and magicians roam around and wreak havoc. There are some safe spaces here and there, maintained by magic (and CD-ROMs).
I found a path to the end but the book likely keeps other mysteries hidden, including flying carpets. I might give it another chance.