Converting Cubemaps to Panoramic images?

Hi, I made a custom skybox with a cubemap from a reflection probe, and I need it in panoramic form (a.k.a. lat/longitude, cylindrical, etc) to show to my client.

As you can see in the above image, Unity can change the "mapping" format of exr files from six-sided cube maps to cylindrical panoramic layouts. But when I open the resulting exr file in Photoshop, it still appears as a six-sided cubemap. So how do I actually generate a panoramic image from this?