diff --git a/modules/home/feh/default.nix b/modules/home/feh/default.nix
index 3a952a2..d72eed2 100644
--- a/modules/home/feh/default.nix
+++ b/modules/home/feh/default.nix
@@ -10,4 +10,11 @@ in
   config.programs.feh = lib.mkIf cfg.enable {
     enable = true;
   };
+
+  config.my.home.xdg.mime-apps = lib.mkIf cfg.enable {
+    applications.media.image = {
+      bitmap = [ "feh.desktop" ];
+      vector = [ "feh.desktop" ];
+    };
+  };
 }
diff --git a/modules/home/firefox/default.nix b/modules/home/firefox/default.nix
index 02c74f2..e1b0e37 100644
--- a/modules/home/firefox/default.nix
+++ b/modules/home/firefox/default.nix
@@ -77,4 +77,8 @@ in
       };
     };
   };
+
+  config.my.home.xdg.mime-apps = lib.mkIf cfg.enable {
+    applications.editor = [ "firefox.desktop" ];
+  };
 }
diff --git a/modules/home/mail/himalaya/default.nix b/modules/home/mail/himalaya/default.nix
index 849a415..fc64013 100644
--- a/modules/home/mail/himalaya/default.nix
+++ b/modules/home/mail/himalaya/default.nix
@@ -20,4 +20,8 @@ in
         '';
     };
   };
+
+  config.my.home.xdg.mime-apps = lib.mkIf cfg.enable {
+    applications.editor = [ "himalaya.desktop" ]; # FIXME: doesn't exist
+  };
 }
diff --git a/modules/home/mpv/default.nix b/modules/home/mpv/default.nix
index 8af394c..1ccd0ba 100644
--- a/modules/home/mpv/default.nix
+++ b/modules/home/mpv/default.nix
@@ -17,5 +17,12 @@ in
         pkgs.mpvScripts.uosc # Nicer UI
       ];
     };
+
+    my.home.xdg.mime-apps = {
+      applications.media = {
+        audio = [ "mpv.desktop" ];
+        video = [ "mpv.desktop" ];
+      };
+    };
   };
 }
diff --git a/modules/home/terminal/default.nix b/modules/home/terminal/default.nix
index 20f36b5..069f79f 100644
--- a/modules/home/terminal/default.nix
+++ b/modules/home/terminal/default.nix
@@ -59,4 +59,5 @@ in
   config.home.sessionVariables = lib.mkIf (cfg.program != null) {
     TERMINAL = cfg.program;
   };
+  # FIXME: config.my.home.xdg.mime-apps.applications.terminal
 }
diff --git a/modules/home/vim/default.nix b/modules/home/vim/default.nix
index 8e6bd5c..557588d 100644
--- a/modules/home/vim/default.nix
+++ b/modules/home/vim/default.nix
@@ -107,4 +107,8 @@ in
   };
 
   config.xdg.configFile = lib.mkIf cfg.enable configFiles;
+
+  config.my.home.xdg.mime-apps = lib.mkIf cfg.enable {
+    applications.editor = [ "nvim.desktop" ];
+  };
 }
diff --git a/modules/home/zathura/default.nix b/modules/home/zathura/default.nix
index 6162542..baefe06 100644
--- a/modules/home/zathura/default.nix
+++ b/modules/home/zathura/default.nix
@@ -17,4 +17,12 @@ in
       "statusbar-home-tilde" = true;
     };
   };
+
+  config.my.home.xdg.mime-apps = lib.mkIf cfg.enable {
+    applications.media.document = {
+      comic = [ "zathura.desktop" ];
+      ebook = [ "zathura.desktop" ];
+      pdf = [ "zathura.desktop" ];
+    };
+  };
 }