diff --git a/AsbCloudInfrastructure/Services/DrillingProgram/DrillingProgramService.cs b/AsbCloudInfrastructure/Services/DrillingProgram/DrillingProgramService.cs
index 5083237e..32773c5d 100644
--- a/AsbCloudInfrastructure/Services/DrillingProgram/DrillingProgramService.cs
+++ b/AsbCloudInfrastructure/Services/DrillingProgram/DrillingProgramService.cs
@@ -51,6 +51,8 @@ namespace AsbCloudInfrastructure.Services.DrillingProgram
         private const int idStateReady = 3;
         private const int idStateError = 4;
 
+        private static readonly string[] filePermittedExt = { ".xlsx", ".xls", ".ods", ".odt", ".doc", ".docx", ".pdf" };
+
         public DrillingProgramService(
             IAsbCloudDbContext context,
             FileService fileService,
@@ -161,13 +163,23 @@ namespace AsbCloudInfrastructure.Services.DrillingProgram
             await EnqueueMakeProgramWorkAsync(idWell, state, token);
             return state;
         }
-
+        private bool ValidExtFile(string file)
+        {
+            var fileExt = Path.GetExtension(file);
+            var badExt = Array.Find(filePermittedExt, e => e == fileExt);
+            if (badExt is null)            
+                return false;            
+            return true;
+        }
         public async Task<int> AddFile(int idWell, int idFileCategory, int idUser, string fileFullName, System.IO.Stream fileStream, CancellationToken token = default)
         {
+            if (!ValidExtFile(fileFullName))
+                throw new FileFormatException($"Файл {fileFullName} - неподдерживаемого формата. Файл не может быть загружен. ");
+
             var part = await context.DrillingProgramParts
-                .Include(p => p.RelatedUsers)
-                .ThenInclude(r => r.User)
-                .FirstOrDefaultAsync(p => p.IdWell == idWell && p.IdFileCategory == idFileCategory, token);
+                    .Include(p => p.RelatedUsers)
+                    .ThenInclude(r => r.User)
+                    .FirstOrDefaultAsync(p => p.IdWell == idWell && p.IdFileCategory == idFileCategory, token);
 
             if (part == null)
                 throw new ArgumentInvalidException($"DrillingProgramPart id == {idFileCategory} does not exist", nameof(idFileCategory));
@@ -465,6 +477,8 @@ namespace AsbCloudInfrastructure.Services.DrillingProgram
             return part;
         }
 
+        
+
         private async Task EnqueueMakeProgramWorkAsync(int idWell, DrillingProgramStateDto state, CancellationToken token)
         {
             if (state.IdState == idStateCreating)