This does not work in the new version of Fiddler Classic.

[z836454898]

I have successfully injected the DLL, but the interface appearance remains unchanged.

[etdon]

Hey, can you try again using the full file path? Relative file paths like ./fiddler-customizer.dll won't get recognized since the target process is trying to load from the specified location and doesn't have the necessary context. Currently the dll injector (assuming you're using the loadlib-dll-injector) doesn't automatically resolve relative paths to full paths to not interfere with potential use cases.

Example: dll-injector.exe "Fiddler.exe" "C:\Users\83645\AppData\Local\Programs\Fiddler\fiddler-customizer.dll"