I had an issue with signing dlls with signtool. I asked it here and someone suggested that separately run the sign tool as it gives detail errors. this the command I ran
signtool.exe sign /tr http://timestamp.sectigo.com /td sha256 /fd sha256 /a "D:\eiXml.dll"
This is the error I got
Done Adding Additional Store
SignTool Error: This file format cannot be signed because it is not recognized.
SignTool Error: An error occurred while attempting to sign: D:\eiXml.dll
This is a .DLL too. Dont know why its hapenning. Can any one please guide me here. Here is the link for .dll file https://drive.google.com/file/d/1RzM65R2Vw19vPodBxCl8QHQoMho4GOJ7/view?usp=sharing
I tried to upload this to a dll sharing site but it also says

But man this is a dll. Kindly let me know how to handle this.