Text case sensitive search

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As you've discovered, LR generally ignores case in filters and smart collections. That has nothing to do with the underlying operating system -- it's a design choice from the earliest days of LR.

The Any Filter plugin does let you do case-sensitive searching using the "matches" operator, e.g.

It's reasonably fast, searching 36K photos in about 5 seconds.

Any Filter uses a Metadata browser column to display its search results, which avoids a longstanding LR bug with plugins creating large collections. By default it resets any existing columns, but you can tell Any Filter to add its column to the end of the existing columns:

You can uncheck the option "Show results using a Library filter", in which case Any Filter won't use the Metadata browser at all, saving the results as a collection instead.  But if there are more than 1K to 2K search results, it could take a very long time for LR to create the collection on behalf of the plugin, due to the aforementioned bug.

Regarding catalog updating, here's what the Install instructions say: When you first install Any Filter, "Lightroom will present a scary-looking, cryptic message: 'Your catalog must be updated before it can be used with the following plugin'. Click Update Catalog. This warning is harmless and is shown for plugins that store their own data in the catalog (which is many of them)—but don’t worry, Lightroom ensures such plugins can’t corrupt your catalog."

After reading the new stuff in LrC 11 it appears that this small, very useful feature was not added. 😞

I put in a new feature request to have an Ignore case option added to Lightroom:

https://feedback.photoshop.com/conversations/lightroom-classic/lightroom-classic-please-add-case-sensitive-text-search/61124f8de7ad7876d4377187 

If you would like to see this added then please go there and up vote. 🙂  Thank you.

I am trying to post a message that contains 2 small JPEGs (18kb each, 792x99 pixels each), but it won't allow me to post the message.  I embedded the small images using the Insert Photos icon.  Any ideas?

You would need a plugin. Perhaps this one:

John R. Ellis Lightroom Plugins | Any Filter

or maybe:

Jeffrey’s “Extended Search” Lightroom Plugin

LrC uses your OS file manager for that, just like it uses your OS file manager to display the Folders panel. So, if the OS does not support that, then no.

And their is no option, well in the Windows version, to search on exact text, just Contains, Contains All, Dosen't Contain, Starts With, and Ends With.

No one knows how to do this?