diff --git a/core.d.ts b/core.d.ts
index f65d949e..032533fc 100644
--- a/core.d.ts
+++ b/core.d.ts
@@ -146,6 +146,7 @@ export type FileExtension =
 	| 'dwg'
 	| 'parquet'
 	| 'class'
+	| 'arj'
 	; // eslint-disable-line semi-style
 
 export type MimeType =
@@ -288,6 +289,7 @@ export type MimeType =
 	| 'image/vnd.dwg'
 	| 'application/x-parquet'
 	| 'application/java-vm'
+	| 'application/x-arj'
 	; // eslint-disable-line semi-style
 
 export type FileTypeResult = {
diff --git a/core.js b/core.js
index 5f1ee351..1c174829 100644
--- a/core.js
+++ b/core.js
@@ -149,6 +149,13 @@ class FileTypeParser {
 			};
 		}
 
+		if (this.check([0x60, 0xEA])) {
+			return {
+				ext: 'arj',
+				mime: 'application/x-arj',
+			};
+		}
+
 		// -- 3-byte signatures --
 
 		if (this.check([0xEF, 0xBB, 0xBF])) { // UTF-8-BOM
diff --git a/fixture/fixture.arj b/fixture/fixture.arj
new file mode 100644
index 00000000..7bce8c7e
Binary files /dev/null and b/fixture/fixture.arj differ
diff --git a/package.json b/package.json
index 0fdea9d6..37d5887b 100644
--- a/package.json
+++ b/package.json
@@ -198,7 +198,8 @@
 		"pst",
 		"dwg",
 		"parquet",
-		"class"
+		"class",
+		"arj"
 	],
 	"dependencies": {
 		"readable-web-to-node-stream": "^3.0.2",
diff --git a/readme.md b/readme.md
index 9081db4e..de75240e 100644
--- a/readme.md
+++ b/readme.md
@@ -351,6 +351,7 @@ Returns a `Set<string>` of supported MIME types.
 - [`ape`](https://en.wikipedia.org/wiki/Monkey%27s_Audio) - Monkey's Audio
 - [`apng`](https://en.wikipedia.org/wiki/APNG) - Animated Portable Network Graphics
 - [`ar`](https://en.wikipedia.org/wiki/Ar_(Unix)) - Archive file
+- [`arj`](https://en.wikipedia.org/wiki/ARJ) - Archive file
 - [`arrow`](https://arrow.apache.org) - Columnar format for tables of data
 - [`arw`](https://en.wikipedia.org/wiki/Raw_image_format#ARW) - Sony Alpha Raw image file
 - [`asar`](https://github.com/electron/asar#format) - Archive format primarily used to enclose Electron applications
diff --git a/supported.js b/supported.js
index 631d07a4..10481f89 100644
--- a/supported.js
+++ b/supported.js
@@ -143,6 +143,7 @@ export const extensions = [
 	'dwg',
 	'parquet',
 	'class',
+	'arj',
 ];
 
 export const mimeTypes = [
@@ -285,4 +286,5 @@ export const mimeTypes = [
 	'image/vnd.dwg',
 	'application/x-parquet',
 	'application/java-vm',
+	'application/x-arj',
 ];