Problem is that the executability of files is (at least on Windows) communicated in-band in the filename. In-band signalling was proven to be a bad idea ever si

Problem is that the executability of files is (at least on Windows) communicated in-band in the filename. In-band signalling was proven to be a bad idea ever since the early days of phone phreaking. Unicode is fine for what it is - conveying text across languages and scripts. The problem is that some environments use the filename as more than what it should be (a memo field for the user and not an instruction for the machine whether to execute the file as code).