The filename begins with cat4500es8 , which immediately identifies the platform:
: Engineered for the Supervisor Engine 8-E (WS-X45-SUP8-E), leveraging its dual-core 2.2GHz CPU and advanced line-rate hardware forwarding capacities. Feature Sets via Software Activation cat4500es8-universalk9.spa.03.11.05.e.152-7.e5.bin