关于TCL/TK的文件打开问题，请大虾指导！

zzh_adiy

运行TCL/TK 的语句“set f [open |quads.exe r+]”，提示错误，怎么解决，具体错误提示如下：

couldn't execute "quads.exe": no such file or directory
couldn't open "C:/Tcl/lib/tclIndex": permission denied
    while executing
"open [file join $dir tclIndex]"