How to decompile an exe or a dll to assembly

Question

I am really interested in assembly language and I want to learn about how exe files work how dlls run etc... and I have an idea of writing an application to decompile an exe

Answer 1

There are a lot of dissemblers already written for you (see above), but I don't think reading disassembled code is going to help you become a better assembly writer. The main reason for this is that compilers do A LOT of optimization before they generate assemblies. Often this makes for very tricky code to read but highly efficient code to analyze.