diff --git a/edge/src/names.rs b/edge/src/names.rs
index 78dc549..c42c417 100644
--- a/edge/src/names.rs
+++ b/edge/src/names.rs
@@ -50,7 +50,8 @@ static SUFFIXES: LazyLock<Vec<(Regex, &'static str)>> = LazyLock::new(|| {
 /// fileStem with the regexes, as in the TypeScript (the reference for file_stem's tests).
 #[allow(dead_code)]
 pub fn file_stem_re(name: &str) -> String {
-    let mut stem = replace(&OLD_RAR_VOLUME, js::trim(name), "", false);
+    let trimmed = js::trim(name);
+    let mut stem = if old_volume_at(trimmed.as_bytes()) { replace(&OLD_RAR_VOLUME, trimmed, "", false) } else { trimmed.to_string() };
     let mut changed = true;
     while changed {
         changed = false;
@@ -68,8 +69,19 @@ pub fn file_stem_re(name: &str) -> String {
     stem
 }
 
-/// Old-style rar volumes after .r99, as the file's own extension, lower case, not x or z (".x64"): /\.[s-v]\d{2}$/.
-static OLD_RAR_VOLUME: LazyLock<Regex> = LazyLock::new(|| re(r"\.[s-v][0-9]{2}$"));
+/// Old-style rar volumes after .r99 and split zip volumes, as the file's own extension, lower case; .xNN but not
+/// .x32/.x64/.x86 (no lookahead here: the builds are put back by old_volume_at).
+static OLD_RAR_VOLUME: LazyLock<Regex> = LazyLock::new(|| re(r"\.(?:[s-vxz])[0-9]{2}$"));
+
+/// Whether a name ends with an old rar or split zip volume (OLD_RAR_VOLUME without the .x builds).
+fn old_volume_at(b: &[u8]) -> bool {
+    let len = b.len();
+    len >= 4
+        && b[len - 4] == b'.'
+        && matches!(b[len - 3], b's'..=b'v' | b'x' | b'z')
+        && b[len - 2..].iter().all(u8::is_ascii_digit)
+        && !(b[len - 3] == b'x' && matches!(&b[len - 2..], b"32" | b"64" | b"86"))
+}
 static QUOTED: LazyLock<Regex> = LazyLock::new(|| re(r#""[^"]*""#));
 static COUNTERS: LazyLock<Regex> = LazyLock::new(|| re(r"\[[0-9]+/[0-9]+\]|\([0-9]+/[0-9]+\)"));
 static YENC_END: LazyLock<Regex> = LazyLock::new(|| re(r"(?i)\byEnc\b(SP+[0-9]+)?SP*$"));
@@ -216,7 +228,7 @@ pub fn file_stem(name: &str) -> String {
     let b = stem.as_bytes();
     let mut len = b.len();
     // Old-style rar volumes after .r99 (".s41"), as the file's own extension, lower case.
-    if len >= 4 && b[len - 4] == b'.' && (b's'..=b'v').contains(&b[len - 3]) && b[len - 2..].iter().all(u8::is_ascii_digit) {
+    if old_volume_at(b) {
         len -= 4;
     }
     let mut changed = true;
@@ -1428,6 +1440,9 @@ mod image_set_tests {
             ("the.office.us.s01.rar", "the.office.us.s01"),
             ("Some.Show.S01", "Some.Show.S01"),
             ("Electric.Rain.Swift.3D.PS.v1.0.142.x64", "Electric.Rain.Swift.3D.PS.v1.0.142.x64"),
+            ("App.x86", "App.x86"),
+            ("Licence 700790900887990.z18", "Licence 700790900887990"),
+            ("Licence 077887994400668.x12", "Licence 077887994400668"),
             ("chappelle1.part02.rev", "chappelle1"),
             ("chappelle1.rev", "chappelle1"),
             ("VwE3i90MVX9dqMFuDfzdS7Q6.part1.par2", "VwE3i90MVX9dqMFuDfzdS7Q6"),
diff --git a/lib/release/identity.ts b/lib/release/identity.ts
index d571414..2f1cd21 100644
--- a/lib/release/identity.ts
+++ b/lib/release/identity.ts
@@ -49,8 +49,9 @@ const SUFFIXES = [
 /** Strips per-file suffixes (volume numbers, archive and par2 extensions) from a filename. */
 export function fileStem(name: string): string {
   // Old-style rar volumes after .r99 ("BD_NoTHing018.s41", "….s00", ".t91", ".v81"): only as the file's own extension, in
-  // lower case, so a season ("show.s01.rar", "Show.S01") stays; not x or z (".x64", ".x86" builds; ".z01" goes with .zip).
-  let stem = name.trim().replace(/\.[s-v]\d{2}$/, '')
+  // lower case, so a season ("show.s01.rar", "Show.S01") stays. Split zip volumes (".z18"), and .xNN but not the builds
+  // ".x32", ".x64", ".x86" ("Licence 700790900887990.z18", "….x31"; "….v1.0.142.x64" stays).
+  let stem = name.trim().replace(/\.(?:[s-vz]\d{2}|x(?!32$|64$|86$)\d{2})$/, '')
   let changed = true
   while (changed) {
     changed = false
diff --git a/tests/unit/release/identity.spec.ts b/tests/unit/release/identity.spec.ts
index 2e51327..7100e17 100644
--- a/tests/unit/release/identity.spec.ts
+++ b/tests/unit/release/identity.spec.ts
@@ -305,6 +305,9 @@ test.group('release / par2 names', () => {
     assert.equal(fileStem('the.office.us.s01.rar'), 'the.office.us.s01')
     assert.equal(fileStem('Some.Show.S01'), 'Some.Show.S01')
     assert.equal(fileStem('Electric.Rain.Swift.3D.PS.v1.0.142.x64'), 'Electric.Rain.Swift.3D.PS.v1.0.142.x64')
+    assert.equal(fileStem('App.x86'), 'App.x86')
+    assert.equal(fileStem('Licence 700790900887990.z18'), 'Licence 700790900887990')
+    assert.equal(fileStem('Licence 077887994400668.x12'), 'Licence 077887994400668')
     assert.equal(fileStem('chappelle1.part02.rev'), 'chappelle1')
     assert.equal(fileStem('chappelle1.rev'), 'chappelle1')
     assert.equal(fileStem('VwE3i90MVX9dqMFuDfzdS7Q6.part1.par2'), 'VwE3i90MVX9dqMFuDfzdS7Q6')