Resolve plain text format extensions

crates/file-formats/src/lib.rs

@@ -38,6 +38,7 @@ pub enum Format {
     Xlsx,
     TaggedText,
     Pptx,
+    PlainText,
     Gcode,
     Studio,
     StencilCraft,
@@ -134,6 +135,7 @@ pub fn from_extension(ext: &str) -> Option<Format> {
         "rtf" => Some(Format::Rtf),
         "xlsx" => Some(Format::Xlsx),
         "pptx" => Some(Format::Pptx),
+        "txt" | "text" | "md" => Some(Format::PlainText),
         "studio" | "studio3" => Some(Format::Studio),
         "stencilcraft" => Some(Format::StencilCraft),
         "gcode" | "nc" => Some(Format::Gcode),