Chlorpheniramine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose.
ORC file is a Voyetra Digital Orchestrator Pro Song. Voyetra Digital Orchestrator Pro is a multitrack sequencer for MIDI and audio. Digital Orchestrator is a discontinued product.
A file with the AVC file extension is most likely a Kaspersky Virus Database file, which the Kaspersky antivirus software uses to store information regarding updates to the program. They're normally named with a file update number, something like base008.avc.