Where do I put the file?

I don't understand where to put it.  The instructions say to put it in http://www.yourdomain.com/index.php/password_reset_tool, but my neither Windows nor my FTP client will allow me to create a folder named "index.php" as there is already a file with that name.
You are reading too fast.

2. Upload the file password_reset_tool.inc.php to the corresponding path of your LiteCart installation.
It's in pages, so it should be uploaded to pages.

3. Browse to http://www.yourdomain.com/index.php/password_reset_tool
Or try the rewritten url: http://www.yourdomain.com/en/password_reset_tool
This is a virtual webpath, not a filesystem path or a folder you create.
Thank you.  you're right, I misread the instructions.  I had tried putting it in my installation folder ("store"), and various other folders, but then I mistyped the URL.

I had been trying to browse to 
http://www.sodhouserecords.com/store/index.php/password_reset_tool.inc.php

the correct URL is 
http://www.sodhouserecords.com/store/index.php/password_reset_tool

When I use the correct URL, the reset tool works!   
or I should say the script RUNS...  it does not seem to have changed my password.