diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5bf6b765..cee27cb5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 
 ### Changes
 
+* [#1971](https://github.com/bbatsov/projectile/pull/1971): Support `slnx` files for dotnet project types.
 * [#1958](https://github.com/bbatsov/projectile/issues/1958): Exclude `.projectile-cache.eld` from search results (ripgrep/ag/grep) by default.
 * [#1957](https://github.com/bbatsov/projectile/pull/1957): Add `:caller` information to calls to `ivy-read` (used by packages like `ivy-rich`).
 * [#1947](https://github.com/bbatsov/projectile/issues/1947): `projectile-project-name` should be marked as safe.
diff --git a/projectile.el b/projectile.el
index 5d8ce401..0160feb3 100644
--- a/projectile.el
+++ b/projectile.el
@@ -3148,7 +3148,8 @@ it acts on the current project."
   "Check if a project contains a .NET solution project marker.
 When DIR is specified it checks DIR's project, otherwise
 it acts on the current project."
-  (or (projectile-verify-file-wildcard "?*.sln" dir)))
+  (or (projectile-verify-file-wildcard "?*.sln" dir)
+      (projectile-verify-file-wildcard "?*.slnx" dir)))
 
 (defun projectile-go-project-p (&optional dir)
   "Check if a project contains Go source files.
@@ -3372,7 +3373,7 @@ a manual COMMAND-TYPE command is created with
                                   :run "dotnet run"
                                   :test "dotnet test")
 (projectile-register-project-type 'dotnet-sln #'projectile-dotnet-sln-project-p
-                                  :project-file "?*.sln"
+                                  :project-file '("?*.sln" "?*.slnx")
                                   :compile "dotnet build"
                                   :run "dotnet run"
                                   :test "dotnet test")
diff --git a/test/projectile-test.el b/test/projectile-test.el
index 4ebe3bd9..886766af 100644
--- a/test/projectile-test.el
+++ b/test/projectile-test.el
@@ -1377,6 +1377,14 @@ Just delegates OPERATION and ARGS for all operations except for`shell-command`'.
       (let ((projectile-indexing-method 'native))
         (spy-on 'projectile-project-root :and-return-value (file-truename (expand-file-name "project/")))
         (expect (projectile-detect-project-type) :to-equal 'dotnet-sln)))))
+  (it "detects project-type for dotnet slnx projects"
+    (projectile-test-with-sandbox
+     (projectile-test-with-files
+      ("project/"
+       "project/Project.slnx")
+      (let ((projectile-indexing-method 'native))
+        (spy-on 'projectile-project-root :and-return-value (file-truename (expand-file-name "project/")))
+        (expect (projectile-detect-project-type) :to-equal 'dotnet-sln)))))
   (it "detects project-type for Julia PkgTemplates.jl projects"
     (projectile-test-with-sandbox
      (projectile-test-with-files