Added a way to read what the AI received from your sources (#1100)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/FileContentHash.cs

@@ -10,6 +10,11 @@ internal static class FileContentHash
     /// <summary>
     /// Computes a lowercase SHA-256 hash for a file without loading it fully into memory.
     /// </summary>
+    /// <remarks>
+    /// The file is read while other programs may keep it open, even for writing, as an office
+    /// program does with a document being edited. The runtime reads files for extraction the same
+    /// way, so a file which can be indexed can always be hashed.
+    /// </remarks>
     /// <param name="path">The file path.</param>
     /// <param name="token">The cancellation token.</param>
     /// <returns>The lowercase hexadecimal hash.</returns>
@@ -19,7 +24,7 @@ internal static class FileContentHash
             path,
             FileMode.Open,
             FileAccess.Read,
-            FileShare.Read,
+            FileShare.ReadWrite | FileShare.Delete,
             65_536,
             FileOptions.Asynchronous | FileOptions.SequentialScan);