alt Hacker NewsWinRAR also seems to handle opening a file in an external app without manually extracting much better. I can just double-click a file in an archive and open it in an external app, while with 7-zip it seems to immediately delete the temporary file so the external app ends up trying to open a non-existent file. Rather annoying if you're just trying to quickly check something like the readme.txt in an archive.
>while with 7-zip it seems to immediately delete the temporary file so the external app ends up trying to open a non-existent file.
No, 7-zip only deletes the file after you close its window, so as long as you don't close 7-zip any apps should be able to open those files. Winrar doesn't delete on close, but that has its own problems, namely that you accumulate a bunch of extracted files in your %TEMP% directory, and have to run disk cleanup to delete them.