diff --git a/code/Sun.rc b/code/Sun.rc
index f0c05960..359ca35c 100644
--- a/code/Sun.rc
+++ b/code/Sun.rc
@@ -117,7 +117,7 @@ END
 
 // Icon with lowest ID value placed first to ensure application icon
 // remains consistent on all systems.
-IDI_SUN                 ICON    DISCARDABLE     "sun.ico"
+IDI_SUN                 ICON    DISCARDABLE     "resources/app-icon/opents.ico"
 IDI_CHECKED             ICON    DISCARDABLE     "checked.ico"
 IDI_UNCHECKED           ICON    DISCARDABLE     "unchecked.ico"
 IDI_GREYED              ICON    DISCARDABLE     "greyed.ico"
diff --git a/code/resources/app-icon/build-ico.sh b/code/resources/app-icon/build-ico.sh
new file mode 100755
index 00000000..63aae8ff
--- /dev/null
+++ b/code/resources/app-icon/build-ico.sh
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+icon_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+
+if ! command -v magick >/dev/null 2>&1; then
+	echo "Error: ImageMagick 'magick' was not found." >&2
+	exit 1
+fi
+
+magick \
+	\( -background none "$icon_dir/opents.svg" -resize 256x256 \) \
+	\( -background none "$icon_dir/opents.svg" -resize 128x128 \) \
+	\( -background none "$icon_dir/opents.svg" -resize 64x64 \) \
+	\( -background none "$icon_dir/opents.svg" -resize 48x48 \) \
+	\( -background none "$icon_dir/opents-flat.svg" -resize 32x32 \) \
+	\( -background none "$icon_dir/opents-flat.svg" -resize 24x24 \) \
+	\( -background none "$icon_dir/opents-flat.svg" -resize 16x16 \) \
+	"$icon_dir/opents.ico"
+
+echo "Created $icon_dir/opents.ico"
diff --git a/code/resources/app-icon/opents-flat.svg b/code/resources/app-icon/opents-flat.svg
new file mode 100644
index 00000000..bb9c295a
--- /dev/null
+++ b/code/resources/app-icon/opents-flat.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="256" height="256" viewBox="0 0 256 256"><path fill="#f8e665" d="M80.14 1.61c43.21 0 78.25 35.04 78.25 78.25 0 43.22-35.04 78.26-78.25 78.26-43.22 0-78.26-35.04-78.26-78.26 0-43.21 35.04-78.25 78.26-78.25"/><path fill="#51452b" d="M59.66 2.76c-42.93 11.5-68.4 55.63-56.9 98.56 11.5 42.92 55.63 68.4 98.56 56.9 42.92-11.5 68.4-55.63 56.9-98.56-11.51-42.93-55.63-68.4-98.56-56.9m1.58 28.4-3.78 8.76 15.1 59.72-17.12 13.41-37.7-28.45-1.15-2.93.73-6.68 2.26-6.37 43.23 33.63 1.56-.24 5.54-4.19-7.51-25.36-10.39-7.85 9.69 3.89-3.55-12.56-14.5-13.77 12.65 6.88-2.37-8.19.57-3.93-14.08-11.54 16.35 8.59 3.11-5.88-3.53-3.74L41.67 11.9l20.67 11.94s9.71-3.22 22.83-2.72c19.43.74 46.68 10.51 59.29 45.02 2.99 8.18 2.47 16.99 1.96 24.03-1.69 23.29-16.49 38.04-16.49 38.04l-3.55 2.22-12.14-9-11.16-1.33-1.39.19-2.16-.68-7.79-6.2 7.12-11.09 8.34-3.14 13.46 4.5 1.77-.11 1.79 1.32 1.87 2.92.94.83.5-.14-1.09-4.75 2.81 1.77.35.63s.02.73.23 1.51c.27 1.03.76 2.18.76 2.18l3.31-1.78-.21-4.81-1.46-1.41-.91-1.38-.3-3.16-3.25-4.71-42.04-30.53 7.46 14.4-2.18 1.3zM50.21 85.45 21.89 63.14l.84-5.63 3.38-4.87 18.48 12.52zm1.83 31.03-1.94 2.86-24.16 8.64-.66.9 4.83 3.93 24.4-9.78.44.96-21.97 8.77-.66.89 6.61 3.82 17.17-10.55.77.88-16.7 10.96 4.78 3.04 13.94-11.84.36 1.34-12.34 11.77 3.38 2.52 13.43-14.41 18.25-9.21 18.34 6.62.68 2.52 13.66 9.3s-15.17 7.87-27.64 9.07c-15.04 1.44-27.85-3.74-27.85-3.74l-4.07-3.06-4.37 5.86-29.09-20.49 9.3-4.29-5.03-5.32-8.71-23.78.46-4.99zm61.31 9.69 10.7 6.32-6.54 5.18-8.88-6.27z"/><path fill="#b52b17" d="m94.49 215.77 56.3-94.89h48.85l56.61 94.89-26.76 40.46H121.56z"/><path fill="#050505" d="m100.83 213.64 51.88-87.46h45.03l52.17 87.46-24.66 37.29h-99.48z"/><path fill="#ee2e18" d="m111.26 213.32 47.01-77.98h34.1l47 77.98-19.2 28.38h-89.42z"/><path fill="#050505" d="M152.19 231.09c0-2.81 5.79-8.44 11.53-12.07 3.63-2.29 7.74-2.7 9.68-2.26 2.08 6.83 4.87 7.16 4.87 7.16-.89-.41 3.98-17.38 15.19-20.64 3.84 5.26 7.66 6.05 7.66 6.05-.19-.02-1.2-.79-1.91-2.21-2.13-4.24-5.17-13-1.72-20 4.88 1.26 8.12-.93 8.03-.92-.42.04-14.11-4.28-15.69-14.45 4.67-2.83 5.06-5.45 5.06-5.45-.62.04-.66.47-.86.86-.28.56-.56 1.3-2.21 1.4-4.08.25-12.86 1.19-18.46-4.84 1.68-3.87 1.83-4.35 1.65-4.76-.24-.57-5.95 9.34-15.9 9.47-.87-2.05-1.41-3.9-2.05-4.14-.37.17-1.2.81-1.07 1.26.41 1.38.84 4.82.32 6.43-.48 1.49-1.68 2.81-2.49 3.82-2.19 2.71-3.89 4.75-3.64 5.12.59.35 1.41.56 2.62 2.67 1.9 3.3 2.57 8.73 3.49 10.76 4.24 9.34-4.22 15.6-5.75 16.22 7.31-7.34 2.47-15.84-1.58-17.89-3.59-1.81-6.62-2.67-7.09-7.17 0-3.2.39-3.18 1.72-3.73-1.42 0-1.27-11.46 3.09-17.35.67-.91 1.46-1.1 2.35-1.28 1.23-.25 2.98-.57 3.28-1.78-3.68-1.14-2.72-8.41 7.99-10.13 3.11-.5 6.7-1.12 11.95.15.85-.9 7.93-9.34 22.94 8.3 9.34-1.65 13.68 8.74 15.51 15.65 1.41 5.3-.88 7.59-.85 7.57s5.38-.96 5.28 8.16c-.05 5.02-1.71 9.2-3.69 13.44-.73 1.56-1.69 2.44-2.22 3.93-.61 1.73-.67 3.44-.75 4.1-.26 2.2-.86 4.1-2.03 5.68-5.84 7.89-18.69 10.81-22.15 11.72-3.91 8.84-14.73 9.04-23.79 9.18-2.65.04-3.98-1.5-5.28-3.69-.62-1.04-3.03-2.32-3.03-4.34"/></svg>
\ No newline at end of file
diff --git a/code/resources/app-icon/opents.ico b/code/resources/app-icon/opents.ico
new file mode 100644
index 00000000..1bd42391
Binary files /dev/null and b/code/resources/app-icon/opents.ico differ
diff --git a/code/resources/app-icon/opents.svg b/code/resources/app-icon/opents.svg
new file mode 100644
index 00000000..befb189d
--- /dev/null
+++ b/code/resources/app-icon/opents.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="256" height="256" viewBox="0 0 256 256"><path fill="url(#a)" d="M80.14 1.61c43.21 0 78.25 35.04 78.25 78.25 0 43.22-35.04 78.26-78.25 78.26-43.22 0-78.26-35.04-78.26-78.26 0-43.21 35.04-78.25 78.26-78.25"/><path fill="url(#b)" d="M59.66 2.76c-42.93 11.5-68.4 55.63-56.9 98.56 11.5 42.92 55.63 68.4 98.56 56.9 42.92-11.5 68.4-55.63 56.9-98.56-11.51-42.93-55.63-68.4-98.56-56.9m1.58 28.4-3.78 8.76 15.1 59.72-17.12 13.41-37.7-28.45-1.15-2.93.73-6.68 2.26-6.37 43.23 33.63 1.56-.24 5.54-4.19-7.51-25.36-10.39-7.85 9.69 3.89-3.55-12.56-14.5-13.77 12.65 6.88-2.37-8.19.57-3.93-14.08-11.54 16.35 8.59 3.11-5.88-3.53-3.74L41.67 11.9l20.67 11.94s9.71-3.22 22.83-2.72c19.43.74 46.68 10.51 59.29 45.02 2.99 8.18 2.47 16.99 1.96 24.03-1.69 23.29-16.49 38.04-16.49 38.04l-3.55 2.22-12.14-9-11.16-1.33-1.39.19-2.16-.68-7.79-6.2 7.12-11.09 8.34-3.14 13.46 4.5 1.77-.11 1.79 1.32 1.87 2.92.94.83.5-.14-1.09-4.75 2.81 1.77.35.63s.02.73.23 1.51c.27 1.03.76 2.18.76 2.18l3.31-1.78-.21-4.81-1.46-1.41-.91-1.38-.3-3.16-3.25-4.71-42.04-30.53 7.46 14.4-2.18 1.3zM50.21 85.45 21.89 63.14l.84-5.63 3.38-4.87 18.48 12.52zm1.83 31.03-1.94 2.86-24.16 8.64-.66.9 4.83 3.93 24.4-9.78.44.96-21.97 8.77-.66.89 6.61 3.82 17.17-10.55.77.88-16.7 10.96 4.78 3.04 13.94-11.84.36 1.34-12.34 11.77 3.38 2.52 13.43-14.41 18.25-9.21 18.34 6.62.68 2.52 13.66 9.3s-15.17 7.87-27.64 9.07c-15.04 1.44-27.85-3.74-27.85-3.74l-4.07-3.06-4.37 5.86-29.09-20.49 9.3-4.29-5.03-5.32-8.71-23.78.46-4.99zm61.31 9.69 10.7 6.32-6.54 5.18-8.88-6.27z"/><path fill="#a52a12" d="m94.49 215.77 56.3-94.89h48.85l56.61 94.89-26.76 40.46H121.56z"/><path d="m100.83 213.64 51.88-87.46h45.03l52.17 87.46-24.66 37.29h-99.48z"/><path fill="url(#c)" d="m111.26 213.32 47.01-77.98h34.1l47 77.98-19.2 28.38h-89.42z"/><path d="M152.19 231.09c0-2.81 5.79-8.44 11.53-12.07 3.63-2.29 7.74-2.7 9.68-2.26 2.08 6.83 4.87 7.16 4.87 7.16-.89-.41 3.98-17.38 15.19-20.64 3.84 5.26 7.66 6.05 7.66 6.05-.19-.02-1.2-.79-1.91-2.21-2.13-4.24-5.17-13-1.72-20 4.88 1.26 8.12-.93 8.03-.92-.42.04-14.11-4.28-15.69-14.45 4.67-2.83 5.06-5.45 5.06-5.45-.62.04-.66.47-.86.86-.28.56-.56 1.3-2.21 1.4-4.08.25-12.86 1.19-18.46-4.84 1.68-3.87 1.83-4.35 1.65-4.76-.24-.57-5.95 9.34-15.9 9.47-.87-2.05-1.41-3.9-2.05-4.14-.37.17-1.2.81-1.07 1.26.41 1.38.84 4.82.32 6.43-.48 1.49-1.68 2.81-2.49 3.82-2.19 2.71-3.89 4.75-3.64 5.12.59.35 1.41.56 2.62 2.67 1.9 3.3 2.57 8.73 3.49 10.76 4.24 9.34-4.22 15.6-5.75 16.22 7.31-7.34 2.47-15.84-1.58-17.89-3.59-1.81-6.62-2.67-7.09-7.17 0-3.2.39-3.18 1.72-3.73-1.42 0-1.27-11.46 3.09-17.35.67-.91 1.46-1.1 2.35-1.28 1.23-.25 2.98-.57 3.28-1.78-3.68-1.14-2.72-8.41 7.99-10.13 3.11-.5 6.7-1.12 11.95.15.85-.9 7.93-9.34 22.94 8.3 9.34-1.65 13.68 8.74 15.51 15.65 1.41 5.3-.88 7.59-.85 7.57s5.38-.96 5.28 8.16c-.05 5.02-1.71 9.2-3.69 13.44-.73 1.56-1.69 2.44-2.22 3.93-.61 1.73-.67 3.44-.75 4.1-.26 2.2-.86 4.1-2.03 5.68-5.84 7.89-18.69 10.81-22.15 11.72-3.91 8.84-14.73 9.04-23.79 9.18-2.65.04-3.98-1.5-5.28-3.69-.62-1.04-3.03-2.32-3.03-4.34"/><linearGradient id="a" x1="44" x2="-53" y1="-44" y2="53" gradientUnits="userSpaceOnUse"><stop offset=".045" stop-color="#fce164"/><stop offset=".136" stop-color="#fef26b"/><stop offset=".227" stop-color="#fefd71"/><stop offset=".318" stop-color="#faf971"/><stop offset=".409" stop-color="#fafa72"/><stop offset=".5" stop-color="#f9f970"/><stop offset=".591" stop-color="#f9ef6a"/><stop offset=".682" stop-color="#fbe264"/><stop offset=".773" stop-color="#fad15d"/><stop offset=".864" stop-color="#f8bd54"/><stop offset=".955" stop-color="#dba349"/></linearGradient><linearGradient id="b" x1="56.5" x2="-56.5" y1="-56.5" y2="56.5" gradientUnits="userSpaceOnUse"><stop offset=".045" stop-color="#54472c"/><stop offset=".136" stop-color="#5e5031"/><stop offset=".227" stop-color="#665735"/><stop offset=".318" stop-color="#6e5e39"/><stop offset=".409" stop-color="#71603b"/><stop offset=".5" stop-color="#6f5e3a"/><stop offset=".591" stop-color="#6b5b38"/><stop offset=".682" stop-color="#655634"/><stop offset=".773" stop-color="#5b4d2f"/><stop offset=".864" stop-color="#53452a"/><stop offset=".955" stop-color="#4a3e26"/></linearGradient><linearGradient id="c" x1="27.85" x2="47.82" y1="157.95" y2="271.18" gradientUnits="userSpaceOnUse"><stop offset=".071" stop-color="#c22a12"/><stop offset=".214" stop-color="#db2912"/><stop offset=".357" stop-color="#f62b12"/><stop offset=".5" stop-color="#f22b12"/><stop offset=".643" stop-color="#e82b12"/><stop offset=".786" stop-color="#cf2b12"/><stop offset=".929" stop-color="#c42a12"/></linearGradient></svg>
\ No newline at end of file
diff --git a/code/sun.ico b/code/sun.ico
deleted file mode 100644
index d386cda9..00000000
Binary files a/code/sun.ico and /dev/null differ