How do I make a perfect exr-file in RC?

When I export an exr file from
RC, it becomes totally black when I open it as a map in another app and when I adjust the light settings, it becomes very grainy and I cant see any of the original pattern at all.

Anybody here who know what to do?

Hello @Erixnc

Which version are you using? What are your exact steps and settings to get such results? Where are you opening the EXR file?