Issue #1482 has been updated by Evgeniy Dolzhenko. Documentation for exec method says: * The standard shell means always <code>"/bin/sh"</code> on Unix-like systems, * <code>ENV["RUBYSHELL"]</code> or <code>ENV["COMSPEC"]</code> on Windows NT series, and * similar. but I still can't get it to run my customized interpreter. When you say that it depends on "the association of file extension to programs" does that mean association of batch files? I tried to change this to my customized interpreter (Control Panel\Programs\Default Programs\Set Associations in Windows 7) and Ruby is still running cmd.exe (in the original test case). ---------------------------------------- http://redmine.ruby-lang.org/issues/show/1482 ---------------------------------------- http://redmine.ruby-lang.org