Can I search for files which contain a specific string in a folder if that folder is not in the search index?

So, lets say folder 'textFiles' is not in the index. I navigate to this folder in windows explorer. I type '.ini' in the search box I want to see a result list containing only 'b.txt'

FOLDER C:\textFiles\

FILE  a.php  
CONTENT once twice thrice mice moose monkey

FILE b.txt
CONTENT mingle muddle middle.ini banana beer

FILE c.spo
CONTENT sellotape stapler phone book

I do not have permission to add folders to the windows index and I do not have permission to install or run any executables that did not ship with the server or approved applications.

I'd be happy with a windows native command line solution if necessary?

Thanks G