Weird IIS Problem - GIF/JPG wont cache

i have a windows server running IIS that wont let the client's browser cache the jpg/gif images. nor can the client save the gif and jpgs as ".gif" or ".jpg" from their browser. they can be only saved as .bmp. im pretty sure its a server side problem not client side. anyone know which settings affect this in IIS?

 

 

 

 

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