I have installed Gpg4win version 2.3.3 on windows 8.1 and 10.

No registry entries are created for file types created or used by
GPG like:
ASC,GPG,KBX,PGP,PKR,SIG,SIGN,SKR

Of course by shell extension GpgEX a context menue exist, but i am used
to open a file directly by mouse-clicking.

Furthermore no human readable description , mime type or icon for above
mentioned file name extensions exist.

Of cource i am able to create/modify such tings by my self with the help of the
Registry Editor or by NirSoft's FileTypesMan but i think the GPG installer
should do this work.

So i look what was used on OpenSuSE 13.2 Linux system and i also checked this
information by using 2 web sites http://extension.nirsoft.net/
http://file-extension.net/seeker/ especially if also other file types exist.

mime type extension description other icon
description

desc.

application/ ASC, PGP/MIME encrypted message header ~8 keyhole on
paper sheet
pgp-encypted PGP " ~3

GPG            "                                 0

application/ ASC, PGP keys ~8 safe wheel
on paper sheet
pgp-keys PGP " ~3

GPG            "                                 0     
SKR            PGP keys (secret key ring)        1     
PKR            PGP keys (public key ring)        1

application/ ASC, detached OpenPGP signature ~8 pencil
creating signature
pgp-signature PGP " ~3

GPG            "                                 0     
SIG            "                                 ~11
SIGN           "                                 0

• KBX GNU Privacy Guard keybox file 2 -

mime type action command
pgp-encypted decrypt kleopatra -d
pgp-keys import keys kleopatra --import-certificate
pgp-signature decrypt&verify kleopatra -D

I hope that Gpg4win installer in next versions create registry entries for such
file name extensions.