diff --git a/edge/src/names.rs b/edge/src/names.rs
index 7c47d66..78dc549 100644
--- a/edge/src/names.rs
+++ b/edge/src/names.rs
@@ -68,8 +68,8 @@ pub fn file_stem_re(name: &str) -> String {
     stem
 }
 
-/// Old-style rar volumes after .r99, as the file's own extension, lower case: /\.[s-z]\d{2}$/.
-static OLD_RAR_VOLUME: LazyLock<Regex> = LazyLock::new(|| re(r"\.[s-z][0-9]{2}$"));
+/// Old-style rar volumes after .r99, as the file's own extension, lower case, not x or z (".x64"): /\.[s-v]\d{2}$/.
+static OLD_RAR_VOLUME: LazyLock<Regex> = LazyLock::new(|| re(r"\.[s-v][0-9]{2}$"));
 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 +216,7 @@ 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'z').contains(&b[len - 3]) && b[len - 2..].iter().all(u8::is_ascii_digit) {
+    if len >= 4 && b[len - 4] == b'.' && (b's'..=b'v').contains(&b[len - 3]) && b[len - 2..].iter().all(u8::is_ascii_digit) {
         len -= 4;
     }
     let mut changed = true;
@@ -1427,6 +1427,7 @@ mod image_set_tests {
             ("x8ZRmX5N83mrokOwqJtoIGHTrqXQrgCyj.s00", "x8ZRmX5N83mrokOwqJtoIGHTrqXQrgCyj"),
             ("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"),
             ("chappelle1.part02.rev", "chappelle1"),
             ("chappelle1.rev", "chappelle1"),
             ("VwE3i90MVX9dqMFuDfzdS7Q6.part1.par2", "VwE3i90MVX9dqMFuDfzdS7Q6"),
diff --git a/lib/release/identity.ts b/lib/release/identity.ts
index 72ac3a9..d571414 100644
--- a/lib/release/identity.ts
+++ b/lib/release/identity.ts
@@ -48,9 +48,9 @@ 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"): only as the file's own extension, in lower case, so
-  // a season ("show.s01.rar", "Show.S01") stays.
-  let stem = name.trim().replace(/\.[s-z]\d{2}$/, '')
+  // Old-style rar volumes after .r99 ("BD_NoTHing018.s41", "….s00", ".t91", ".v81"): only as the file's own extension, in
+  // lower case, so a season ("show.s01.rar", "Show.S01") stays; not x or z (".x64", ".x86" builds; ".z01" goes with .zip).
+  let stem = name.trim().replace(/\.[s-v]\d{2}$/, '')
   let changed = true
   while (changed) {
     changed = false
diff --git a/tests/unit/release/identity.spec.ts b/tests/unit/release/identity.spec.ts
index 8d20d0e..2e51327 100644
--- a/tests/unit/release/identity.spec.ts
+++ b/tests/unit/release/identity.spec.ts
@@ -304,6 +304,7 @@ test.group('release / par2 names', () => {
     // A season stays.
     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('chappelle1.part02.rev'), 'chappelle1')
     assert.equal(fileStem('chappelle1.rev'), 'chappelle1')
     assert.equal(fileStem('VwE3i90MVX9dqMFuDfzdS7Q6.part1.par2'), 'VwE3i90MVX9dqMFuDfzdS7Q6')