diff --git a/src/app/model_ops.rs b/src/app/model_ops.rs
index accf338ee..ee3eed0c2 100644
--- a/src/app/model_ops.rs
+++ b/src/app/model_ops.rs
@@ -469,6 +469,7 @@ impl super::OpenCADStudio {
     /// SECTION — draw the cross-section outline where an axis-aligned plane
     /// (X/Y/Z = `axis` at `value`) cuts the one selected solid, as Line entities.
     /// Reuses the mesh-interference analyzer to find the cut segments.
+    #[cfg(feature = "solid3d")]
     pub(super) fn solid_section(&mut self, axis: usize, value: f64) -> Task<Message> {
         use acadrust::types::Vector3;
         use acadrust::Line;
@@ -576,6 +577,14 @@ impl super::OpenCADStudio {
         Task::none()
     }
 
+    /// Without `solid3d` (e.g. wasm) there is no mesh-interference kernel.
+    #[cfg(not(feature = "solid3d"))]
+    pub(super) fn solid_section(&mut self, _axis: usize, _value: f64) -> Task<Message> {
+        self.command_line
+            .push_error("SECTION: solid modelling is unavailable in this build.");
+        Task::none()
+    }
+
     /// PYRAMID — create an `n`-sided pyramid (regular polygon base of the given
     /// circumradius, apex at `height`) as a tessellated mesh, reusing the same
     /// face→Shell→mesh path as LOFT. Each face is independent, so no closed-shell
diff --git a/src/io/file_association.rs b/src/io/file_association.rs
index 300769ccf..a5ca6141f 100644
--- a/src/io/file_association.rs
+++ b/src/io/file_association.rs
@@ -37,7 +37,6 @@ const APP_ID: &str = "io.github.HakanSeven12.OpenCadStudio";
 /// Idempotent and best-effort; safe to call on every launch. Runs synchronously
 /// (registry / small file writes), so callers should invoke it off the UI
 /// thread.
-#[cfg(not(target_arch = "wasm32"))]
 pub fn register_as_handler() -> Result<(), String> {
     #[cfg(target_os = "windows")]
     {