\fBimagex optimize\fR does not support split WIMs.
+\fBimagex optimize\fR is roughly equivalent to:
+.RS
+.PP
+\fBimagex export\fR \fIWIMFILE\fR all tmp.wim [--check] && mv tmp.wim \fIWIMFILE\fR
+.RE
+.PP
+
.SH SEE ALSO
.BR imagex (1)
+.BR imagex-export (1)