From af72a45035a61752de4a0046debbd035c31399ee Mon Sep 17 00:00:00 2001
From: Thorsten Sommer <SommerEngineering@users.noreply.github.com>
Date: Fri, 20 Feb 2026 14:13:10 +0100
Subject: [PATCH] Fixed handling of paths in Pandoc exports (#674)

---
 .../Tools/PandocProcessBuilder.cs             | 60 +++++++++++--------
 .../wwwroot/changelog/v26.2.2.md              |  1 +
 2 files changed, 37 insertions(+), 24 deletions(-)

diff --git a/app/MindWork AI Studio/Tools/PandocProcessBuilder.cs b/app/MindWork AI Studio/Tools/PandocProcessBuilder.cs
index c2c404a7..6d95ad9f 100644
--- a/app/MindWork AI Studio/Tools/PandocProcessBuilder.cs	
+++ b/app/MindWork AI Studio/Tools/PandocProcessBuilder.cs	
@@ -1,6 +1,5 @@
 using System.Diagnostics;
 using System.Reflection;
-using System.Text;
 
 using AIStudio.Tools.Metadata;
 using AIStudio.Tools.Services;
@@ -74,36 +73,49 @@ public sealed class PandocProcessBuilder
     
     public async Task<PandocPreparedProcess> BuildAsync(RustService rustService)
     {
-        var sbArguments = new StringBuilder();
-
-        if (this.useStandaloneMode)
-            sbArguments.Append(" --standalone ");
-        
-        if(!string.IsNullOrWhiteSpace(this.providedInputFile))
-            sbArguments.Append(this.providedInputFile);
-        
-        if(!string.IsNullOrWhiteSpace(this.providedInputFormat))
-            sbArguments.Append($" -f {this.providedInputFormat}");
-        
-        if(!string.IsNullOrWhiteSpace(this.providedOutputFormat))
-            sbArguments.Append($" -t {this.providedOutputFormat}");
-        
-        foreach (var additionalArgument in this.additionalArguments)
-            sbArguments.Append($" {additionalArgument}");
-        
-        if(!string.IsNullOrWhiteSpace(this.providedOutputFile))
-            sbArguments.Append($" -o {this.providedOutputFile}");
-        
         var pandocExecutable = await PandocExecutablePath(rustService);
-        return new (new ProcessStartInfo
+        var startInfo = new ProcessStartInfo
         {
             FileName = pandocExecutable.Executable,
-            Arguments = sbArguments.ToString(),
             RedirectStandardOutput = true,
             RedirectStandardError = true,
             UseShellExecute = false,
             CreateNoWindow = true
-        }, pandocExecutable.IsLocalInstallation);
+        };
+
+        // Use argument tokens instead of a single command string so paths with spaces
+        // or Unicode characters are passed to Pandoc unchanged on all platforms.
+        if (this.useStandaloneMode)
+            startInfo.ArgumentList.Add("--standalone");
+
+        if (!string.IsNullOrWhiteSpace(this.providedInputFile))
+            startInfo.ArgumentList.Add(this.providedInputFile);
+
+        if (!string.IsNullOrWhiteSpace(this.providedInputFormat))
+        {
+            startInfo.ArgumentList.Add("-f");
+            startInfo.ArgumentList.Add(this.providedInputFormat);
+        }
+
+        if (!string.IsNullOrWhiteSpace(this.providedOutputFormat))
+        {
+            startInfo.ArgumentList.Add("-t");
+            startInfo.ArgumentList.Add(this.providedOutputFormat);
+        }
+
+        foreach (var additionalArgument in this.additionalArguments)
+        {
+            if (!string.IsNullOrWhiteSpace(additionalArgument))
+                startInfo.ArgumentList.Add(additionalArgument);
+        }
+
+        if (!string.IsNullOrWhiteSpace(this.providedOutputFile))
+        {
+            startInfo.ArgumentList.Add("-o");
+            startInfo.ArgumentList.Add(this.providedOutputFile);
+        }
+
+        return new(startInfo, pandocExecutable.IsLocalInstallation);
     }
     
     /// <summary>
diff --git a/app/MindWork AI Studio/wwwroot/changelog/v26.2.2.md b/app/MindWork AI Studio/wwwroot/changelog/v26.2.2.md
index 2865df75..713854bf 100644
--- a/app/MindWork AI Studio/wwwroot/changelog/v26.2.2.md	
+++ b/app/MindWork AI Studio/wwwroot/changelog/v26.2.2.md	
@@ -17,6 +17,7 @@
 - Fixed an issue where manually saving chats in workspace manual-storage mode could appear unreliable during response streaming. The save button is now disabled while streaming to prevent partial saves.
 - Fixed an issue where in some places "No profile" was displayed instead of the localized text.
 - Fixed a bug in the Responses API of our OpenAI provider implementation where streamed whitespace chunks were discarded. We thank Oliver Kunc `OliverKunc` for his first contribution in resolving this issue. We appreciate your help, Oliver.
+- Fixed a bug in the Microsoft Word export via Pandoc where target paths containing spaces or Unicode characters could be split into invalid command arguments, resulting in export failures.
 - Fixed the Google Gemini model API. Switched to the default OpenAI-compatible API to retrieve the model list after Google changed the previous API, which stopped working.
 - Upgraded to .NET 9.0.13 & Rust 1.93.1.
 - Upgraded dependencies.
\ No newline at end of file