diff --git a/platform/platform-impl/src/com/intellij/ide/actions/OpenFileAction.kt b/platform/platform-impl/src/com/intellij/ide/actions/OpenFileAction.kt
index 20847219ac98..3145be054803 100644
--- a/platform/platform-impl/src/com/intellij/ide/actions/OpenFileAction.kt
+++ b/platform/platform-impl/src/com/intellij/ide/actions/OpenFileAction.kt
@@ -167,7 +167,7 @@ open class OpenFileAction : AnAction(), DumbAware, LightEditCompatible, ActionRe
     val file = virtualFile.toNioPath()
     if (Files.isDirectory(file)) {
       val fromWelcomeScreenProject = project != null &&
-                                     WelcomeScreenProjectProvider.EP_NAME.lazySequence().singleOrNull { it.isWelcomeScreenProject(project) } != null
+                                     WelcomeScreenProjectProvider.isSingleWelcomeScreenProject(project)
       @Suppress("TestOnlyProblems")
       val openedProject = ProjectUtil.openExistingDir(file, project, forceReuseFrame = fromWelcomeScreenProject)
       if (openedProject != null && Registry.`is`("ide.create.project.root.entity")) {
diff --git a/platform/platform-impl/src/com/intellij/openapi/wm/ex/WelcomeScreenProjectProvider.kt b/platform/platform-impl/src/com/intellij/openapi/wm/ex/WelcomeScreenProjectProvider.kt
index 052c1507f731..3ed4af69fcba 100644
--- a/platform/platform-impl/src/com/intellij/openapi/wm/ex/WelcomeScreenProjectProvider.kt
+++ b/platform/platform-impl/src/com/intellij/openapi/wm/ex/WelcomeScreenProjectProvider.kt
@@ -1,6 +1,7 @@
 // Copyright 2000-2025 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
 package com.intellij.openapi.wm.ex
 
+import com.intellij.openapi.diagnostic.thisLogger
 import com.intellij.openapi.extensions.ExtensionPointName
 import com.intellij.openapi.project.Project
 import org.jetbrains.annotations.ApiStatus
@@ -11,12 +12,25 @@ import org.jetbrains.annotations.ApiStatus
  *
  * E.g., if a project is created/opened/cloned from a welcome screen project,
  * we should close the welcome screen project to preserve the welcome screen experience.
+ *
+ * This customization is intended to be used per-IDE, not per language.
  */
 @ApiStatus.Internal
-interface WelcomeScreenProjectProvider {
+abstract class WelcomeScreenProjectProvider {
   companion object {
-    val EP_NAME: ExtensionPointName<WelcomeScreenProjectProvider> = ExtensionPointName("com.intellij.welcomeScreenProjectProvider")
+    private val EP_NAME: ExtensionPointName<WelcomeScreenProjectProvider> = ExtensionPointName("com.intellij.welcomeScreenProjectProvider")
+
+    @JvmStatic
+    fun isSingleWelcomeScreenProject(project: Project): Boolean {
+      val providers = EP_NAME.extensionList
+      if (providers.isEmpty()) return false
+      if (providers.size > 1) {
+        thisLogger().warn("Multiple WelcomeScreenProjectProvider extensions")
+        return false
+      }
+      return providers.first().isWelcomeScreenProject(project)
+    }
   }
 
-  fun isWelcomeScreenProject(project: Project): Boolean
+  protected abstract fun isWelcomeScreenProject(project: Project): Boolean
 }
diff --git a/platform/vcs-impl/src/com/intellij/openapi/vcs/checkout/ProjectDirCheckoutListener.kt b/platform/vcs-impl/src/com/intellij/openapi/vcs/checkout/ProjectDirCheckoutListener.kt
index da7fc50da12f..711beace24b4 100644
--- a/platform/vcs-impl/src/com/intellij/openapi/vcs/checkout/ProjectDirCheckoutListener.kt
+++ b/platform/vcs-impl/src/com/intellij/openapi/vcs/checkout/ProjectDirCheckoutListener.kt
@@ -50,5 +50,5 @@ private class PlatformProjectCheckoutListener : CheckoutListener {
 }
 
 private fun willOpenFromWelcomeScreenProject(project: Project): Boolean {
-  return WelcomeScreenProjectProvider.EP_NAME.lazySequence().singleOrNull { it.isWelcomeScreenProject(project) } != null
+  return WelcomeScreenProjectProvider.isSingleWelcomeScreenProject(project)
 }