I had cause to want to recover some files again today and struck the same BSOD problem again. Did some additional troubleshooting. Ran the MINIDUMP file through the Microsoft Debugging Tool and extracted this bit of info:
That's actually "coreServiceShell.exe" which is the active executable part of the Trend Micro Antivirus system service. So your assessment of it likely being an antivirus issue was spot on.
I disabled the Trend Micro AV service and then attempted to run my guest files restore again. It worked perfectly. I tried using the Trend AV Management Console to instruct the AV Agent to ignore everything except the C:\ drive, but this didn't make any difference. So there is some fundamental incompatibility between what the Veeam software is attempting to do and what the Trend AV agent thinks ought to be happening.
I have opened a support case and will hand over all relevant logs and analysis, just in case anything can be done about it from the Veeam end of things. But there probably isn't anything which can be done, and I seriously doubt whether I can get Trend interested in the case (but I will try).
In the meantime, the workaround for me is to (a) manually disable the Trend AV service; (b) run the guest files restore; and (c) restart the AV service again.