> I would like to make a file read-only, but only if no other process
> currently has it open.  I had hoped that setting the read-only attribute
>
>      if ( Win32::File::SetAttributes( $file, READONLY ) ) { ... }
>

Try this:

if ($fh = Win32API::File::createFile( $file, 'r', '' ) ) {
      # no one else has the file open
} else {
      # someone does
}


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