diff --git a/runner/Dockerfile b/runner/Dockerfile
index 8f0f9bf..3818483 100644
--- a/runner/Dockerfile
+++ b/runner/Dockerfile
@@ -12,10 +12,13 @@ ENV DEBIAN_FRONTEND=noninteractive \
     WINEDLLOVERRIDES="mscoree,mshtml=" \
     PYTHON_VERSION=3.12.8
 
-# Wine (64-bit), node + git for JS actions, and build/package tooling.
-RUN apt-get update && apt-get install -y --no-install-recommends \
+# Wine (32-bit + 64-bit: winetricks/regedit needs the 32-bit parts),
+# node + git for JS actions, and build/package tooling.
+RUN dpkg --add-architecture i386 \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends \
         ca-certificates curl wget unzip zip \
-        wine wine64 xvfb xauth cabextract \
+        wine wine64 wine32 xvfb xauth cabextract \
         nodejs git \
     && apt-get clean && rm -rf /var/lib/apt/lists/*