https://bugs.winehq.org/show_bug.cgi?id=37047
--- Comment #11 from Ken Thomases ken@codeweavers.com --- A bundle is a directory (a.k.a. folder) with a specific internal structure. Most applications on a Mac are bundles. So, for example, Mail.app is actually a directory that contains the Mail program executable as well as a bunch of related files, such as image files, translations of the text to various languages, possibly helper programs, metadata such as the Info.plist file, etc.
Wine is not like that. There are many files that are part of Wine but they are not assembled into an application bundle. The executable is in one place (e.g. /usr/local/bin) while the resources are elsewhere (e.g. /usr/local/lib, /usr/local/share, etc.). In particular, there's no separate Info.plist file. The information that would normally go in an Info.plist file in a bundled app is instead embedded inside the executable.
Anyway, to the system, Wine appears to be just a standalone executable, not an application. Therefore, it won't be recognized by things which are only capable of dealing with applications.