These BUL files are just containers of: timestamp, filename and data.
Without the size of the data it's not possible to extract the data and I don't see any TOC (table with information about the archived files).
Do you have other smaller files with the same name and different extension? like common.idx or similar.
In resource folder there one file with similar extension .inx besides .bik and .bul files maybe this will help
there some other files but i think they will not help there in scripts folderhttps://drive.google.com/open?id=1Ye5St ... -_QONoYHbX
and there files from scripts folder if it will help somehowhttps://drive.google.com/open?id=13q0O0 ... TJ9I4rRtsz