diff --git a/Cargo.lock b/Cargo.lock
index 891437aa0..7610f1a70 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1104,7 +1104,7 @@ name = "craft-document-bundle"
 version = "0.1.0"
 source = "git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf#ba24fe2435adb3c81ad6057faf36365fbba736cf"
 dependencies = [
- "craft-zip",
+ "craft-zip 0.1.0 (git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf)",
  "serde_json",
  "thiserror 2.0.21",
  "zip 9.1.1",
@@ -1144,12 +1144,12 @@ dependencies = [
 [[package]]
 name = "craft-eps"
 version = "0.1.0"
-source = "git+https://github.com/storytold/craft-libs?rev=b4ada28f1#b4ada28f19067d4693e902e0e5f32eb292241e3a"
+source = "git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf#ba24fe2435adb3c81ad6057faf36365fbba736cf"
 
 [[package]]
 name = "craft-eps"
 version = "0.1.0"
-source = "git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf#ba24fe2435adb3c81ad6057faf36365fbba736cf"
+source = "git+https://github.com/storytold/craft-libs?rev=fccc0082711b8ae4e19824dd20339a8473d47309#fccc0082711b8ae4e19824dd20339a8473d47309"
 
 [[package]]
 name = "craft-epub"
@@ -1157,17 +1157,21 @@ version = "0.1.0"
 source = "git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf#ba24fe2435adb3c81ad6057faf36365fbba736cf"
 dependencies = [
  "craft-xml 0.1.0 (git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf)",
- "craft-zip",
+ "craft-zip 0.1.0 (git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf)",
  "thiserror 2.0.21",
 ]
 
 [[package]]
 name = "craft-file-formats"
 version = "0.1.0"
-source = "git+https://github.com/storytold/craft-libs?rev=b4ada28f1#b4ada28f19067d4693e902e0e5f32eb292241e3a"
+source = "git+https://github.com/storytold/craft-libs?rev=fccc0082711b8ae4e19824dd20339a8473d47309#fccc0082711b8ae4e19824dd20339a8473d47309"
 dependencies = [
- "craft-eps 0.1.0 (git+https://github.com/storytold/craft-libs?rev=b4ada28f1)",
- "craft-svg 0.1.0 (git+https://github.com/storytold/craft-libs?rev=b4ada28f1)",
+ "craft-eps 0.1.0 (git+https://github.com/storytold/craft-libs?rev=fccc0082711b8ae4e19824dd20339a8473d47309)",
+ "craft-idml 0.1.0 (git+https://github.com/storytold/craft-libs?rev=fccc0082711b8ae4e19824dd20339a8473d47309)",
+ "craft-svg 0.1.0 (git+https://github.com/storytold/craft-libs?rev=fccc0082711b8ae4e19824dd20339a8473d47309)",
+ "craft-zip 0.1.0 (git+https://github.com/storytold/craft-libs?rev=fccc0082711b8ae4e19824dd20339a8473d47309)",
+ "serde",
+ "serde_json",
 ]
 
 [[package]]
@@ -1204,7 +1208,17 @@ version = "0.1.0"
 source = "git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf#ba24fe2435adb3c81ad6057faf36365fbba736cf"
 dependencies = [
  "craft-xml 0.1.0 (git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf)",
- "craft-zip",
+ "craft-zip 0.1.0 (git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf)",
+ "thiserror 2.0.21",
+]
+
+[[package]]
+name = "craft-idml"
+version = "0.1.0"
+source = "git+https://github.com/storytold/craft-libs?rev=fccc0082711b8ae4e19824dd20339a8473d47309#fccc0082711b8ae4e19824dd20339a8473d47309"
+dependencies = [
+ "craft-xml 0.1.0 (git+https://github.com/storytold/craft-libs?rev=fccc0082711b8ae4e19824dd20339a8473d47309)",
+ "craft-zip 0.1.0 (git+https://github.com/storytold/craft-libs?rev=fccc0082711b8ae4e19824dd20339a8473d47309)",
  "thiserror 2.0.21",
 ]
 
@@ -1290,7 +1304,7 @@ version = "0.1.0"
 source = "git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf#ba24fe2435adb3c81ad6057faf36365fbba736cf"
 dependencies = [
  "craft-xml 0.1.0 (git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf)",
- "craft-zip",
+ "craft-zip 0.1.0 (git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf)",
  "log",
  "thiserror 2.0.21",
 ]
@@ -1362,9 +1376,9 @@ source = "git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad605
 [[package]]
 name = "craft-svg"
 version = "0.1.0"
-source = "git+https://github.com/storytold/craft-libs?rev=b4ada28f1#b4ada28f19067d4693e902e0e5f32eb292241e3a"
+source = "git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf#ba24fe2435adb3c81ad6057faf36365fbba736cf"
 dependencies = [
- "craft-xml 0.1.0 (git+https://github.com/storytold/craft-libs?rev=b4ada28f1)",
+ "craft-xml 0.1.0 (git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf)",
  "flate2",
  "kurbo",
  "roxmltree 0.21.2",
@@ -1374,9 +1388,9 @@ dependencies = [
 [[package]]
 name = "craft-svg"
 version = "0.1.0"
-source = "git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf#ba24fe2435adb3c81ad6057faf36365fbba736cf"
+source = "git+https://github.com/storytold/craft-libs?rev=fccc0082711b8ae4e19824dd20339a8473d47309#fccc0082711b8ae4e19824dd20339a8473d47309"
 dependencies = [
- "craft-xml 0.1.0 (git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf)",
+ "craft-xml 0.1.0 (git+https://github.com/storytold/craft-libs?rev=fccc0082711b8ae4e19824dd20339a8473d47309)",
  "flate2",
  "kurbo",
  "roxmltree 0.21.2",
@@ -1479,7 +1493,7 @@ dependencies = [
 [[package]]
 name = "craft-xml"
 version = "0.1.0"
-source = "git+https://github.com/storytold/craft-libs?rev=b4ada28f1#b4ada28f19067d4693e902e0e5f32eb292241e3a"
+source = "git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf#ba24fe2435adb3c81ad6057faf36365fbba736cf"
 dependencies = [
  "quick-xml 0.41.0",
  "thiserror 2.0.21",
@@ -1488,7 +1502,7 @@ dependencies = [
 [[package]]
 name = "craft-xml"
 version = "0.1.0"
-source = "git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf#ba24fe2435adb3c81ad6057faf36365fbba736cf"
+source = "git+https://github.com/storytold/craft-libs?rev=fccc0082711b8ae4e19824dd20339a8473d47309#fccc0082711b8ae4e19824dd20339a8473d47309"
 dependencies = [
  "quick-xml 0.41.0",
  "thiserror 2.0.21",
@@ -1504,6 +1518,16 @@ dependencies = [
  "zip 9.1.1",
 ]
 
+[[package]]
+name = "craft-zip"
+version = "0.1.0"
+source = "git+https://github.com/storytold/craft-libs?rev=fccc0082711b8ae4e19824dd20339a8473d47309#fccc0082711b8ae4e19824dd20339a8473d47309"
+dependencies = [
+ "flate2",
+ "thiserror 2.0.21",
+ "zip 9.1.1",
+]
+
 [[package]]
 name = "crc32fast"
 version = "1.5.3"
@@ -1828,7 +1852,7 @@ dependencies = [
 name = "designcraft-idml"
 version = "0.20.1"
 dependencies = [
- "craft-idml",
+ "craft-idml 0.1.0 (git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf)",
  "craft-xml 0.1.0 (git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf)",
  "designcraft-color",
  "designcraft-compose",
@@ -1944,7 +1968,7 @@ version = "0.20.1"
 dependencies = [
  "craft-docx",
  "craft-file-formats",
- "craft-idml",
+ "craft-idml 0.1.0 (git+https://github.com/storytold/craft-libs?rev=ba24fe2435adb3c81ad6057faf36365fbba736cf)",
  "craft-rtf",
  "craft-wordmodel",
  "craft-xlsx",
diff --git a/Cargo.toml b/Cargo.toml
index 74359a740..bc7d95694 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,7 +26,7 @@ craft-docx = { git = "https://github.com/storytold/craft-libs", rev = "ba24fe243
 craft-wordmodel = { git = "https://github.com/storytold/craft-libs", rev = "ba24fe2435adb3c81ad6057faf36365fbba736cf", version = "=0.1.0" }
 craft-image-codecs = { git = "https://github.com/storytold/craft-libs", rev = "a47b78256c6acf3d7fdc4bc7cfbc25c373eac522", version = "=0.1.0" }
 craft-psd = { git = "https://github.com/storytold/craft-libs", rev = "a47b78256c6acf3d7fdc4bc7cfbc25c373eac522", version = "=0.1.0" }
-craft-file-formats = { git = "https://github.com/storytold/craft-libs", rev = "b4ada28f1", version = "=0.1.0" }
+craft-file-formats = { git = "https://github.com/storytold/craft-libs", rev = "fccc0082711b8ae4e19824dd20339a8473d47309", version = "=0.1.0" }
 # Shared keyboard bindings: chords, overrides, conflicts, egui dispatch, the Keyboard Shortcuts dialog.
 craft-keymap = { git = "https://github.com/storytold/craft-libs", rev = "92d392cff132eaf53e13afff77f38b5c11b73aa0", version = "=0.1.0", features = ["egui", "ui"] }
 # Separations, ink coverage and the ink manager; same revision as craft-pdf and the krilla patch.
diff --git a/crates/engine/src/cmd/file/bytes.rs b/crates/engine/src/cmd/file/bytes.rs
index f169b74e4..c5468d016 100644
--- a/crates/engine/src/cmd/file/bytes.rs
+++ b/crates/engine/src/cmd/file/bytes.rs
@@ -41,7 +41,10 @@ pub(super) fn without_native_extension(name: &str) -> &str {
 /// The first [`DOCUMENT_SNIFF_BYTES`] of a file are enough for packages that start with their
 /// `mimetype` entry, as both formats write them.
 pub fn is_document(bytes: &[u8]) -> bool {
-    designcraft_idml::is_idml(bytes) || designcraft_format::starts_designcraft(bytes) || designcraft_format::is_designcraft(bytes)
+    matches!(
+        craft_file_formats::detect("", bytes),
+        Some(craft_file_formats::Format::DesignCraft | craft_file_formats::Format::DesignCraftJson | craft_file_formats::Format::Idml)
+    )
 }
 
 /// How much of a file [`is_document`] needs to recognise a package by its `mimetype` entry.
diff --git a/crates/engine/src/cmd/file/open.rs b/crates/engine/src/cmd/file/open.rs
index e88d75afc..e41a44135 100644
--- a/crates/engine/src/cmd/file/open.rs
+++ b/crates/engine/src/cmd/file/open.rs
@@ -85,13 +85,8 @@ fn open_path(s: &mut Session, p: &Value) -> Result<Value> {
         // The content decides first: a file's extension may be missing or wrong. The extension
         // then routes files whose content isn't recognised to the reader that explains why.
         let format = craft_file_formats::detect(path, &bytes);
-        let native = format == Some(craft_file_formats::Format::DesignCraft)
-            || designcraft_format::is_designcraft(&bytes)
-            || bytes.trim_ascii_start().starts_with(b"{");
-        if format == Some(craft_file_formats::Format::Idml)
-            || designcraft_idml::is_idml(&bytes)
-            || (!native && format == Some(craft_file_formats::Format::Indd))
-        {
+        let native = matches!(format, Some(craft_file_formats::Format::DesignCraft | craft_file_formats::Format::DesignCraftJson));
+        if format == Some(craft_file_formats::Format::Idml) || (!native && format == Some(craft_file_formats::Format::Indd)) {
             return crate::cmd::interchange::open_idml(s, p);
         }
         if !native {
@@ -163,11 +158,8 @@ pub(super) fn file_open_bytes(s: &mut Session, p: &Value) -> Result<Value> {
     // signature (or their name).
     let name = str_param(p, "name").unwrap_or_default();
     let format = craft_file_formats::detect(name, &b);
-    let native = designcraft_format::is_designcraft(&b) || b.trim_ascii_start().starts_with(b"{");
-    if format == Some(craft_file_formats::Format::Idml)
-        || designcraft_idml::is_idml(&b)
-        || (!native && format == Some(craft_file_formats::Format::Indd))
-    {
+    let native = matches!(format, Some(craft_file_formats::Format::DesignCraft | craft_file_formats::Format::DesignCraftJson));
+    if format == Some(craft_file_formats::Format::Idml) || (!native && format == Some(craft_file_formats::Format::Indd)) {
         return crate::cmd::interchange::open_idml(s, p);
     }
     let (mut d, warnings) = load_bytes(&b)?;
diff --git a/crates/engine/src/cmd/interchange.rs b/crates/engine/src/cmd/interchange.rs
index 0fba3b900..eefb46541 100644
--- a/crates/engine/src/cmd/interchange.rs
+++ b/crates/engine/src/cmd/interchange.rs
@@ -470,9 +470,7 @@ fn warning_item(
 /// the bytes are neither a recognized DesignCraft document nor IDML. The converter explains
 /// unrecognized data with an InDesign extension.
 pub(crate) fn is_indd(name: &str, bytes: &[u8]) -> bool {
-    craft_file_formats::detect(name, bytes) == Some(craft_file_formats::Format::Indd)
-        && !super::file::is_document(bytes)
-        && !bytes.trim_ascii_start().starts_with(b"{")
+    craft_file_formats::detect(name, bytes) == Some(craft_file_formats::Format::Indd) && !super::file::is_document(bytes)
 }
 
 /// `name` without a trailing .idml, .indd or .indt (any case).
diff --git a/crates/ui-egui/src/app/files.rs b/crates/ui-egui/src/app/files.rs
index 79353dcf6..3967c949e 100644
--- a/crates/ui-egui/src/app/files.rs
+++ b/crates/ui-egui/src/app/files.rs
@@ -138,7 +138,10 @@ impl DesignApp {
             return self.run("style.load", params);
         }
         let layout = opens_as_document(&file.name)
-            || (std::path::Path::new(&file.name).extension().is_none() && designcraft_engine::cmd::is_document(&file.bytes));
+            || matches!(
+                format,
+                Some(craft_file_formats::Format::DesignCraft | craft_file_formats::Format::DesignCraftJson | craft_file_formats::Format::Idml)
+            );
         let place = file.request.purpose == "place"
             || (matches!(file.request.purpose.as_str(), "drop" | "open") && !layout && format != Some(craft_file_formats::Format::Ase));
         if place || format == Some(craft_file_formats::Format::Ase) || file.request.purpose == "swatches" {