SQL in Config.ConfigFile returns with fatal error

Choose Logical Mode in dropdown near the Query Builder. Perhaps IRIS SQL tries to do some Logical -> Display conversion and fails.

That looks strange. If you execute the query via JDBC the error ist the same. A CAST to the same datatype as provided from Config.ConfigFile works:

SELECT
       CAST(ID AS VARCHAR(512)),
       CAST(CPFName AS VARCHAR(255)),
       CAST(Comments AS VARCHAR(4096)),
       CAST(Name AS VARCHAR(64)),
       CAST(Product AS VARCHAR(64)),
       CAST(SectionHeader AS VARCHAR(255)),
       CAST(Version AS VARCHAR(7))
FROM Config.ConfigFile

The content of Column COMMENT is expected to be $LB() format.
The most likely reason is : this property contains some ages-old junk 

This works:

SELECT 
ID,
CPFName,
%INTERNAL(Comments),
Name, Product, SectionHeader, Version
FROM Config.ConfigFile

Cache for Windows (x86-64) 2018.1.7 (Build 721U)