diff --git a/packages/data-provider/src/file-config.ts b/packages/data-provider/src/file-config.ts
index 8d2980bd57..f1c4ff9941 100644
--- a/packages/data-provider/src/file-config.ts
+++ b/packages/data-provider/src/file-config.ts
@@ -109,7 +109,7 @@ export const excelMimeTypes =
   /^application\/(vnd\.ms-excel|msexcel|x-msexcel|x-ms-excel|x-excel|x-dos_ms_excel|xls|x-xls|vnd\.openxmlformats-officedocument\.spreadsheetml\.sheet)$/;
 
 export const textMimeTypes =
-  /^(text\/(x-c|x-c\+\+|x-java|html|markdown|x-php|x-python|x-script\.python|x-ruby|x-tex|plain|css|javascript|csv))$/;
+  /^(text\/(x-c|x-csharp|x-c\+\+|x-java|html|markdown|x-php|x-python|x-script\.python|x-ruby|x-tex|plain|css|javascript|csv))$/;
 
 export const applicationMimeTypes =
   /^(application\/(epub\+zip|csv|json|pdf|x-tar|typescript|vnd\.openxmlformats-officedocument\.(wordprocessingml\.document|presentationml\.presentation|spreadsheetml\.sheet)|xml|zip))$/;