If this is set before calling Merge, then it specifies the path and filename to an atttribute assembly, an assembly that will be used to get all of the assembly-level attributes such as Culture, Version, etc.

It will also be used to get the Win32 Resources from. It is mutually exclusive with the CopyAttributes property (Section 2.7).

When it is not specified, then the Win32 Resources from the primary assembly are copied over into the target assembly.

If it is not a full path, then the current directory is used.

Command line option: /attr:filename

Default: null