I downloaded DMD 2.049, which is the latest version available. I tried to write a program using std.thread (incorrectly documented to exist at http://www.digitalmars.com/d/2.0/phobos/std_thread.html), only to find that "module thread is in file 'std\thread.d' which cannot be read".
Further investigation revealed that the distribution of Phobos included in DMD 2.049 HAS NO FILE NAMED THREAD.D! After more investigation (which revealed that D 1.0 has "std.thread"), I noticed that the link to "std.thread" on the Digital Mars web site had the heading "core.thread", and fixed my program. It would have saved me a lot of trouble if the link was also named "core.thread", instead of having the misleading title (and URL) that suggests that the module's name is "std.thread". -- Microsoft Windows. The joke that kills.