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I have horizontal sliding windows that have, over the years stopped latching at the top because the middle has sagged.  Some similar windows have adjustment screws to increase or decrease the height of the rollers on the bottom of the window.  Mine don't.  

My windows are, I believe, Strybuc Industries windows and when you pull them out (lift up and pull the bottom out to remove them) and unscrew the roller assembly at the bottom it looks like the pictures (dirty roller parts) that I included.    

There are 1mm, 2mm, and 3mm stackable shim .stls and a non-stackable 2mm shim included.   Mix and match as needed.