Why is there a AnonymousIdentifier_AD7E5BED-EF7F-59A7-856F-6984BE798469.plist file in CrashReporter folder? I found a file AnonymousIdentifier_AD7E5BED-EF7F-59A7-856F-6984BE798469.plist in my /Library/Application Reporter/CrashReporter folder.

The content of that plist included a dictionary with key AnonHostUUID2 and a long hexadecimal string value.

What would create this file, and why?
CrashReporter creates those files for later uploading to Apple's servers. The files contain anonymous information (hence the prefix AnonymousIdentifier) about the crashes to help Apple diagnose and fix problems.