I just tried ReShade with Space Giraffe (a DirectX 9 game). What happens is that the game window opens, ReShade starts, and then the game crashes with an unhelpful message that says "Impossible to initialise the Neon engine !!!" and then another one that says "This is a fatal error, Neon will now exit." Then the window closes. This happens in both Acid-MIx and NUXX modes.
If the developers want to see what's wrong, the Space Giraffe demo can be downloaded from minotaurproject.co.uk/downloads/SpaceGiraffeSetup105.zip .
EDIT: I pasted the log at pastebin.com/YzLHar9K .