diff --git a/README.md b/README.md
index 5f32060..9e2d4a9 100644
--- a/README.md
+++ b/README.md
@@ -141,9 +141,9 @@ let document = anydoc::to_document(&bytes, None)?;
 
 | Format           | Extensions                                                 |
 | ---------------- | ---------------------------------------------------------- |
-| Word             | `.doc`, `.docx`, `.docm`                                   |
+| Word             | `.doc`, `.docx`, `.docm`, `.wps`                           |
 | PowerPoint       | `.ppt`, `.pps`, `.pot`, `.pptx`, `.pptm`, `.ppsx`, `.ppsm` |
-| Excel            | `.xls`, `.xlsx`, `.xlsm`, `.xlsb`                          |
+| Excel            | `.xls`, `.xlsx`, `.xlsm`, `.xlsb`, `.et`                   |
 | OpenDocument     | `.odt`, `.ods`, `.odp`                                     |
 | Rich Text Format | `.rtf`                                                     |
 | EPUB             | `.epub`                                                    |
diff --git a/src/lib.rs b/src/lib.rs
index 9709949..daa93ba 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -25,7 +25,8 @@ use std::path::Path;
 /// [`Format::from_extension`].
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum Format {
-    /// Binary Word 97-2003 (`.doc`).
+    /// Binary Word 97-2003 (`.doc`), and the OLE2-based Kingsoft WPS Writer
+    /// / Microsoft Works wrapper that shares its `WordDocument` stream (`.wps`).
     Doc,
     /// WordprocessingML (`.docx`, `.docm`), both Transitional and Strict.
     Docx,
@@ -45,8 +46,9 @@ pub enum Format {
     Rtf,
     /// EPUB 2 and 3 (`.epub`).
     Epub,
-    /// Excel workbooks: `.xlsx`, `.xlsm`, binary `.xlsb`, and legacy
-    /// OLE-based `.xls`.
+    /// Excel workbooks in every container calamine reads: `.xlsx`, `.xlsm`,
+    /// `.xlsb`, binary `.xls`, and the OLE2-based Kingsoft WPS Spreadsheet
+    /// wrapper that shares its `Workbook`/`Book` stream (`.et`).
     Excel,
     /// OpenDocument Spreadsheet (`.ods`).
     Ods,
@@ -71,7 +73,9 @@ impl Format {
     /// case-insensitively. `None` for anything unrecognized.
     pub fn from_extension(ext: &str) -> Option<Format> {
         Some(match ext.to_ascii_lowercase().as_str() {
-            "doc" => Format::Doc,
+            // `.wps` is the Kingsoft WPS Writer / Microsoft Works wrapper,
+            // an OLE2 compound file with a `WordDocument` stream like `.doc`.
+            "doc" | "wps" => Format::Doc,
             "docx" | "docm" => Format::Docx,
             "odt" => Format::Odt,
             "pdf" => Format::Pdf,
@@ -79,7 +83,9 @@ impl Format {
             "ppt" | "pps" | "pot" => Format::Ppt,
             "rtf" => Format::Rtf,
             "epub" => Format::Epub,
-            "xlsx" | "xlsm" | "xlsb" | "xls" => Format::Excel,
+            // `.et` is the Kingsoft WPS Spreadsheet wrapper; modern files are
+            // an OLE2 compound file with a `Workbook`/`Book` stream like `.xls`.
+            "xlsx" | "xlsm" | "xlsb" | "xls" | "et" => Format::Excel,
             "ods" => Format::Ods,
             "odp" => Format::Odp,
             "csv" => Format::Csv,