Retrieves the value of a Number-typed file tag attached to the specified vault item.
This method retrieves the value of a Number-typed file tag, identified by TagName, attached to the vault item (file, directory, or alternate stream) specified by FileName. If there isn't a Number-typed file tag with the specified TagName attached to the specified vault item, this method throws an exception.
The value passed for FileName must be a vault-local absolute path. The value passed for TagName may be up to 4095 characters in length (not including the null terminator).
Please refer to the File Tags topic for more information.
Note: This method can only be called when Active is true.