diff --git a/services/progress-service/src/main/kotlin/ru/ysu/lms/progress/SubmissionService.kt b/services/progress-service/src/main/kotlin/ru/ysu/lms/progress/SubmissionService.kt
index 80d3feb..71dde36 100644
--- a/services/progress-service/src/main/kotlin/ru/ysu/lms/progress/SubmissionService.kt
+++ b/services/progress-service/src/main/kotlin/ru/ysu/lms/progress/SubmissionService.kt
@@ -38,6 +38,14 @@ class SubmissionService(
         val last = submissions.findFirstByStudentIdAndLabIdOrderBySeqDesc(studentId, labId)
         val seq = (last?.seq ?: 0) + 1
         val payload = files.mapIndexed { i, f -> (f.originalFilename ?: "file$i") to f.bytes }
+        payload.forEach { (name, bytes) ->
+            if (looksLikeProjectFile(name, bytes)) {
+                throw BadRequestException(
+                    "Файл «$name» похож на файл проекта (XML), а не на исходник. " +
+                        "Приложите файл .c/.h или zip с проектом.",
+                )
+            }
+        }
         val stored = storage.store(studentId, labId, seq, payload)
         val entity = submissions.save(Submission(studentId = studentId, labId = labId, seq = seq))
         return toDto(entity, stored.files)
@@ -70,6 +78,22 @@ class SubmissionService(
         return perStudent.values.map { toDto(it, filesOf(it)) }
     }
 
+    /** Файлы с "исходниковым" расширением, содержимое которых — XML-файл проекта (VS/IDE). */
+    private val sourceExtensions = setOf("c", "h", "cpp", "hpp", "cc", "cxx", "txt")
+
+    private fun looksLikeProjectFile(name: String, bytes: ByteArray): Boolean {
+        val ext = name.substringAfterLast('.', "").lowercase()
+        if (ext !in sourceExtensions) return false
+        val head = String(bytes, 0, minOf(bytes.size, 512), Charsets.UTF_8)
+            .removePrefix("\uFEFF")
+            .trimStart()
+            .lowercase()
+        return head.startsWith("<?xml") ||
+            head.startsWith("<solution") ||
+            head.startsWith("<project") ||
+            head.startsWith("<configurations")
+    }
+
     private fun filesOf(s: Submission): List<String> =
         storage.listFiles(storage.dirFor(s.studentId, s.labId, s.seq))
 
diff --git a/web/src/main/kotlin/ru/ysu/lms/web/admin/AdminController.kt b/web/src/main/kotlin/ru/ysu/lms/web/admin/AdminController.kt
index 87428ca..5aa4a38 100644
--- a/web/src/main/kotlin/ru/ysu/lms/web/admin/AdminController.kt
+++ b/web/src/main/kotlin/ru/ysu/lms/web/admin/AdminController.kt
@@ -326,6 +326,7 @@ class AdminController(
                         source = if (va?.manual == true) "вручную" else "авто",
                         submissionId = submissionsByStudent[s.id]?.id,
                         submissionSeq = submissionsByStudent[s.id]?.seq,
+                        submissionFiles = submissionsByStudent[s.id]?.files ?: emptyList(),
                     )
                 },
             )
diff --git a/web/src/main/kotlin/ru/ysu/lms/web/admin/AdminLabView.kt b/web/src/main/kotlin/ru/ysu/lms/web/admin/AdminLabView.kt
index 4a57fcd..791e5df 100644
--- a/web/src/main/kotlin/ru/ysu/lms/web/admin/AdminLabView.kt
+++ b/web/src/main/kotlin/ru/ysu/lms/web/admin/AdminLabView.kt
@@ -17,6 +17,7 @@ data class AdminLabStudent(
     val source: String,
     val submissionId: String? = null,
     val submissionSeq: Int? = null,
+    val submissionFiles: List<String> = emptyList(),
     val defenseStatus: String? = null,
     val defenseCode: String? = null,
     val defenseSessionId: String? = null,
diff --git a/web/src/main/resources/templates/admin/lab.html b/web/src/main/resources/templates/admin/lab.html
index 7ab840b..b07d59c 100644
--- a/web/src/main/resources/templates/admin/lab.html
+++ b/web/src/main/resources/templates/admin/lab.html
@@ -129,6 +129,9 @@
                             <a th:if="${s.submissionId}" class="cell-link"
                                th:href="'/admin/submissions/' + ${s.submissionId} + '/download'">
                                 попытка <span th:text="${s.submissionSeq}">1</span> ↓</a>
+                            <div th:if="${!#lists.isEmpty(s.submissionFiles)}" class="text-muted text-sm font-mono">
+                                <span th:text="${#strings.listJoin(s.submissionFiles, ', ')}">main.c</span>
+                            </div>
                             <span th:unless="${s.submissionId}" class="text-muted">—</span>
                         </td>
                     </tr>