Fixed attached files silently reaching the AI as empty documents (#904)

app/MindWork AI Studio/Tools/Rust/FileTypes.cs

@@ -51,17 +51,21 @@ public static class FileTypes
     // Document hierarchy
     public static readonly FileTypeFilter PDF         = FileTypeFilter.Leaf("PDF", "pdf");
     public static readonly FileTypeFilter TEXT        = FileTypeFilter.Leaf(TB("Text"), "txt", "md", "rtf");
+    public static readonly FileTypeFilter TABULAR     = FileTypeFilter.Leaf(TB("Tabular text"), "csv", "tsv");
     public static readonly FileTypeFilter MS_WORD     = FileTypeFilter.Leaf("Microsoft Word", "docx");
     public static readonly FileTypeFilter WORD        = FileTypeFilter.Composite("Word", ["odt"], MS_WORD);
     public static readonly FileTypeFilter EXCEL       = FileTypeFilter.Leaf("Excel", "xls", "xlsx");
-    public static readonly FileTypeFilter POWER_POINT = FileTypeFilter.Leaf("PowerPoint", "ppt", "pptx", "odp");
+    
+    // The legacy binary ".ppt" is missing on purpose: AI Studio has no reader for it, so offering
+    // it would only let users attach a file which cannot be read.
+    public static readonly FileTypeFilter POWER_POINT = FileTypeFilter.Leaf("PowerPoint", "pptx", "odp");
     public static readonly FileTypeFilter MAIL        = FileTypeFilter.Leaf(TB("Mail"), "eml", "msg", "mbox");
     public static readonly FileTypeFilter LATEX       = FileTypeFilter.Leaf("LaTeX", "tex", "bib", "sty", "cls", "log");
 
     public static readonly FileTypeFilter OFFICE_FILES = FileTypeFilter.Parent(TB("Office Files"),
         WORD, EXCEL, POWER_POINT, PDF);
     public static readonly FileTypeFilter DOCUMENT     = FileTypeFilter.Parent(TB("Document"),
-        TEXT, OFFICE_FILES, SOURCE_CODE, LATEX);
+        TEXT, TABULAR, OFFICE_FILES, SOURCE_CODE, LATEX);
 
     // Media hierarchy
     public static readonly FileTypeFilter IMAGE = FileTypeFilter.Leaf(TB("Image"),
@@ -84,6 +88,23 @@ public static class FileTypes
     public static readonly FileTypeFilter EXECUTABLES = FileTypeFilter.Leaf(TB("Executable"), "exe", "app", "bin", "appimage");
     public static readonly FileTypeFilter PLUGIN_ARCHIVE = FileTypeFilter.Leaf(TB("Plugin archive"), PluginArchive.PLUGIN_FILE_EXTENSION.TrimStart('.'), "zip");
     
+    /// <summary>
+    /// The file types AI Studio converts using Pandoc.
+    /// </summary>
+    /// <remarks>
+    /// This is not a user-selectable type, it mirrors the formats the Rust runtime hands to
+    /// Pandoc. Every other document type is read by the runtime itself, so it must never depend
+    /// on a Pandoc installation. The name is not localized because it is never shown.
+    /// </remarks>
+    private static readonly FileTypeFilter PANDOC_CONVERTED = FileTypeFilter.Leaf("Pandoc conversion", "docx", "odt", "html", "htm");
+
+    /// <summary>
+    /// Determines whether reading the given file needs Pandoc.
+    /// </summary>
+    /// <param name="filePath">The path of the file to check.</param>
+    /// <returns>True, when reading the file needs Pandoc.</returns>
+    public static bool RequiresPandoc(string filePath) => IsAllowedPath(filePath, PANDOC_CONVERTED);
+
     public static FileTypeFilter? AsOneFileType(params FileTypeFilter[]? types)
     {
         if (types == null || types.Length == 0)