diff --git a/core.js b/core.js
index eb7deb4c..97d5a9e3 100644
--- a/core.js
+++ b/core.js
@@ -59,6 +59,11 @@ function getFileTypeFromMimeType(mimeType) {
 				ext: 'xltx',
 				mime: 'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
 			};
+		case 'application/vnd.ms-excel.template.macroEnabled':
+			return {
+				ext: 'xltm',
+				mime: 'application/vnd.ms-excel.template.macroenabled.12',
+			};
 		case 'application/vnd.openxmlformats-officedocument.wordprocessingml.document':
 			return {
 				ext: 'docx',
diff --git a/fixture/fixture.xltm b/fixture/fixture.xltm
new file mode 100644
index 00000000..807c4a07
Binary files /dev/null and b/fixture/fixture.xltm differ
diff --git a/package.json b/package.json
index e4f63a00..a2a6e23c 100644
--- a/package.json
+++ b/package.json
@@ -222,7 +222,8 @@
 		"lz4",
 		"potx",
 		"xltx",
-		"dotx"
+		"dotx",
+		"xltm"
 	],
 	"dependencies": {
 		"@tokenizer/inflate": "^0.2.6",
diff --git a/readme.md b/readme.md
index a28dc23b..0e357419 100644
--- a/readme.md
+++ b/readme.md
@@ -564,6 +564,7 @@ abortController.abort(); // Abort file-type reading from the Blob stream.
 - [`wv`](https://en.wikipedia.org/wiki/WavPack) - WavPack
 - [`xcf`](https://en.wikipedia.org/wiki/XCF_(file_format)) - eXperimental Computing Facility
 - [`xlsx`](https://en.wikipedia.org/wiki/Office_Open_XML) - Microsoft Excel document
+- [`xltm`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft Excel macro-enabled template
 - [`xltx`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft Excel template
 - [`xm`](https://wiki.openmpt.org/Manual:_Module_formats#The_FastTracker_2_format_.28.xm.29) - Audio module format: FastTracker 2
 - [`xml`](https://en.wikipedia.org/wiki/XML) - eXtensible Markup Language
diff --git a/supported.js b/supported.js
index 1974d3fb..755371d1 100644
--- a/supported.js
+++ b/supported.js
@@ -159,6 +159,7 @@ export const extensions = [
 	'potx',
 	'xltx',
 	'dotx',
+	'xltm',
 ];
 
 export const mimeTypes = [
@@ -317,4 +318,5 @@ export const mimeTypes = [
 	'application/vnd.openxmlformats-officedocument.presentationml.template',
 	'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
 	'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
+	'application/vnd.ms-excel.template.macroenabled.12',
 ];