To add to @ageorgiev, I would steer clear from use relevance to scan the entire file system due to the IO hit a property would cause each tiem to re-evaluates. It is also possible you will not get results as I believe there is a time limit to how long the agent wait before expecting results from a property, which I believe is something like seconds. What works in the debugger may not work at the client level. I would opt to run a task than does a recursive DIR then use a property to read the results of the file, as suggested by @ageorgiev.
If you use the DIR approach, be sure to use the
locked lines of file inspector for the property in case it tries to read the file while the DIR command has it locked for writing.