The files are in .djvu format, which is common for digitized, older technical literature, offering good compression for schematic diagrams.
This file is listed in a FIDO7 archives forum, specifically referencing documents compiled in the early 2000s. 0259.rar
Based on available information from early 2000s archives, refers to an archive file containing historical Soviet-era radio electronics documentation. Review of Content: SHEM0259 - DOSTAI01.RAR The files are in