Syntax error: "(" unexpected

When I run executable files in cygwin, I encountered the following error: Note: "a.out" is a executable file, which can be run in redhat, $ ./a.out ./a.out: 1: Syntax error: "(" unexpected _ Get your FREE download of MSN Explo

problem encountered when installing pgi in cygwin

I tried to install pgi in cygwin. the problem is that after installing, I find that all files that supposed to be executable files(such as pgf90, pgf77...) are not executable in cygwin. And in cygwin, I can not change the permission attribute of files at all. how to solve the problem? thanks.