Smallest Windows app ever: 383 bytes in pure assembly
HelloAssembly The smallest possible complete Windows application
Dave's Garage and PlummersSoftwareLLC present the tiniest complete Windows application, written in x86 assembly. The repo offers several versions, from a 1,104-byte MASM32 build to a 383-byte Yasm one, each with a working message loop, title bar, and system menu. It also warns that aggressive size optimizations may trigger antivirus false positives.
The optimizations embedded in the current code in the Lasse directory, and those applied by Crinkler in general (if used) are rather aggressive, and seem to resemble strategies applied by certain types of malware.