Thanks for the quick fix! By the way, I managed to manually convert the 1.2.1 binary to a DLL with ikvmc.
Although both variants work (at least they seem to), some things are still a bit strange: -There is a huge number of warnings and one error in the output of the build.NET task. -There were a lot of warnings from ikvmc as well. -When I run the program to extract text from a PDF, both .NET versions print warnings to the console. (1.2.1 Java version does not.) -The extracted text produced by the new .NET version (build from revision 979772) is very slightly inferior to that of 1.2.1. -The extracted text produced by Java and .NET (both 1.2.1) slightly differs. The PDF I used (a rather tricky one, I guess) is the one in: ftp://ftp.ncbi.nlm.nih.gov/pub/pmc/00/00/BMC_Med_Genet-11--2867786.tar.gz But I'm O.K. with that. After all, the output of the Java version 1.2.1 and bot .NET versions is not too different.

