Indexing Service is no longer supported as of Windows XP and is unavailable for use as of Windows 8. Instead, use Windows Search for client side search and Microsoft Search Server Express for server side search.
The DefaultColumnFile entry is the full physical path and name of the file to read for column definitions in .asp files and in .idq files.
The DefaultColumnFile entry is found under the key
If the value of the DefaultColumnFile entry is the default, the columns (properties) available for queries are those given in the topic Default Property Names for a Web Catalog.
If a value other than the default is specified, the specified column definitions file includes one line for each column (or property) that can be used in a query. The content and format of the columns definition file is identical to that given in the topic Names Section of .Idq Files.
The value of an identically named entry under the Catalog subkey for a specific catalog cannot override the value of this entry.