3. 種類 (Ruby1.9)Cygwin (Perhaps)MinGW32 (Besteffort)MSWin32 (Besteffort)VC6VC7以降MSWin64 (Besteffort)MinGW64 (Perhaps)BCC32 (Notsupported)出典:http://redmine.ruby-lang.org/wiki/1/SupportedPlatformsJa 4. 見分け方RUBY_PLATFORM 定数を参照する。例)64ビット版か?/mswin64|mingw64/ =~ RUBY_PLATFORM[ruby-dev:41756]C:mp>ruby -vruby 1.9.1p429 (2010-07-02 revision 28523) [i386-mswin32]C:mp>ruby -e 'p RUBY_PLATFORM'"i386-mswin32"