Sometimes it seems that when one can’t tackle a problem “head-on” we must take a “side-ways” approach.
Take a look at this ordinary vinyl sliding window in the following picture. If we look at it we can see that things are not as they should be.

On the right hand side of the window, can you see those two little rectangular openings? Those openings are to let water out. Now if the whole shed were to fill up with water—-all the way up to these openings—-I suppose they might be functional.
On the other hand perhaps the window really needs to be hung as a single-hung window so that the drain holes are on the bottom where they belong. In the next picture I have done a color overlay to show how the track was full of water because it could not drain out.

I guess this installation went “slide-ways.”
By Charles Buell, Real Estate Inspections in Seattle
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Did it have the power open option too ; )
Good catch but it looks like this was done on purpose. Interestingly, some early manufacturers of vinyl windows used the same exact design for slider windows as the double hung. They’d remove the balances, add glide pads and bore the week holes on the side for horizontal installation. In the case of a shed It’s clever to re-purpose this window. There’s an overhang to protect against direct rain and it can’t hurt too much if some water gets in which it looks like there’s is some water marks on the 2×4 sill. By the way, weep holes can be added after the fact.