diff --git a/CreoManager.cpp b/CreoManager.cpp
index bcb1980..85f8d77 100644
--- a/CreoManager.cpp
+++ b/CreoManager.cpp
@@ -499,9 +499,9 @@ std::string CreoManager::GetFileSize(const std::string& filepath) {
             size.LowPart = fileInfo.nFileSizeLow;
             
             double file_size_mb = static_cast<double>(size.QuadPart) / (1024.0 * 1024.0);
-            
+
             std::ostringstream oss;
-            oss << std::fixed << std::setprecision(1) << file_size_mb << "MB";
+            oss << file_size_mb << "MB";
             return oss.str();
         } else {
             DWORD error = GetLastError();
@@ -674,8 +674,9 @@ std::string CreoManager::CalculateAssemblyTotalSize(pfcModel_ptr model) {
         
         // 转换为MB并返回
         double total_mb = total_size_bytes / (1024.0 * 1024.0);
+
         std::ostringstream oss;
-        oss << std::fixed << std::setprecision(1) << total_mb << "MB (from " << processed_count << " files)";
+        oss << total_mb << "MB (from " << processed_count << " files)";
         return oss.str();
         
     }
diff --git a/CreoUtilities.cpp b/CreoUtilities.cpp
new file mode 100644
index 0000000..d23bc05
--- /dev/null
+++ b/CreoUtilities.cpp
@@ -0,0 +1,212 @@
+#include "pch.h"
+#include "CreoUtilities.h"
+#include <windows.h>
+#include <cctype>
+#include <sstream>
+
+// Set Creo working directory
+ChangeDirectoryResult CreoUtilities::SetWorkingDirectory(const std::string& target_directory) {
+    ChangeDirectoryResult result;
+    result.target_directory = target_directory;
+
+    try {
+        // Validate input
+        if (target_directory.empty()) {
+            result.success = false;
+            result.error_message = "Target directory cannot be empty";
+            return result;
+        }
+
+        // Get Creo session
+        pfcSession_ptr session = nullptr;
+        try {
+            session = pfcGetCurrentSessionWithCompatibility(pfcC4Compatible);
+        } catch (...) {
+            session = nullptr;
+        }
+
+        if (!session) {
+            result.success = false;
+            result.error_message = "Failed to get Creo session. Creo may not be running.";
+            return result;
+        }
+
+        // Get current working directory
+        xstring current_dir_xstr;
+        try {
+            current_dir_xstr = session->GetCurrentDirectory();
+            result.original_directory = XStringToString(current_dir_xstr);
+        } catch (...) {
+            result.success = false;
+            result.error_message = "Failed to get current directory";
+            return result;
+        }
+
+        // Normalize and compare paths
+        std::string normalized_current = NormalizePath(result.original_directory);
+        std::string normalized_target = NormalizePath(target_directory);
+
+        // Check if directories are the same
+        if (PathsAreEqual(normalized_current, normalized_target)) {
+            // Already at target directory, no change needed
+            result.success = true;
+            result.directory_changed = false;
+            result.current_directory = result.original_directory;
+            result.message = "Already at target directory, no change needed";
+            return result;
+        }
+
+        // Directories are different, need to change
+        try {
+            xstring target_dir_xstr = StringToXString(target_directory);
+            session->ChangeDirectory(target_dir_xstr);
+        } catch (...) {
+            result.success = false;
+            result.error_message = "Failed to change directory (directory may not exist or is invalid)";
+            result.current_directory = result.original_directory;
+            return result;
+        }
+
+        // Verify the change by reading current directory again
+        try {
+            xstring new_dir_xstr = session->GetCurrentDirectory();
+            result.current_directory = XStringToString(new_dir_xstr);
+        } catch (...) {
+            result.current_directory = target_directory;  // Assume success if we can't verify
+        }
+
+        // Check if change was successful
+        std::string normalized_new = NormalizePath(result.current_directory);
+        if (PathsAreEqual(normalized_new, normalized_target)) {
+            result.success = true;
+            result.directory_changed = true;
+            result.message = "Working directory changed successfully";
+        } else {
+            result.success = false;
+            result.directory_changed = false;
+            result.error_message = "Directory change operation completed but verification failed";
+        }
+
+    } catch (const std::exception& e) {
+        result.success = false;
+        result.error_message = std::string("Unexpected exception: ") + e.what();
+        result.current_directory = result.original_directory;
+    } catch (...) {
+        result.success = false;
+        result.error_message = "Unexpected unknown exception occurred";
+        result.current_directory = result.original_directory;
+    }
+
+    return result;
+}
+
+// Convert xstring to std::string
+std::string CreoUtilities::XStringToString(const xstring& xstr) {
+    try {
+        // Check for null xstring
+        if (xstr.IsNull()) {
+            return "";
+        }
+
+        std::wstring wstr(xstr);
+        if (wstr.empty()) {
+            return "";
+        }
+
+        // Length check to prevent memory issues
+        if (wstr.length() > 32767) {  // Windows API limit
+            return "";
+        }
+
+        // Use WideCharToMultiByte for proper UTF-8 encoding conversion
+        int wstr_len = static_cast<int>(wstr.length());
+        int size_needed = WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), wstr_len, NULL, 0, NULL, NULL);
+        if (size_needed <= 0 || size_needed > 65535) {  // Safety boundary check
+            return "";
+        }
+
+        std::string result(size_needed, 0);
+        WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), wstr_len, &result[0], size_needed, NULL, NULL);
+
+        return result;
+    } catch (...) {
+        return "";
+    }
+}
+
+// Convert std::string to xstring
+xstring CreoUtilities::StringToXString(const std::string& str) {
+    try {
+        if (str.empty()) {
+            return xstring();
+        }
+
+        // Length check to prevent memory issues
+        if (str.length() > 65535) {  // Reasonable length limit
+            return xstring();
+        }
+
+        // Validate input string for invalid characters
+        for (char c : str) {
+            if (c == '\0' && &c != &str.back()) {  // Null character in the middle
+                return xstring();
+            }
+        }
+
+        // Use MultiByteToWideChar for proper UTF-8 decoding conversion
+        int str_len = static_cast<int>(str.length());
+        int size_needed = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, str.c_str(), str_len, NULL, 0);
+        if (size_needed <= 0 || size_needed > 32767) {  // Safety boundary check
+            return xstring();
+        }
+
+        std::wstring wstr(size_needed, 0);
+        MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, str.c_str(), str_len, &wstr[0], size_needed);
+
+        return xstring(wstr.c_str());
+    } catch (...) {
+        return xstring();
+    }
+}
+
+// Normalize path for comparison
+std::string CreoUtilities::NormalizePath(const std::string& path) {
+    if (path.empty()) {
+        return "";
+    }
+
+    std::string normalized = path;
+
+    // Replace forward slashes with backslashes (Windows standard)
+    std::replace(normalized.begin(), normalized.end(), '/', '\\');
+
+    // Remove trailing backslash if present (except for root paths like "C:\")
+    if (normalized.length() > 3 && normalized.back() == '\\') {
+        normalized.pop_back();
+    }
+
+    // Convert to lowercase for case-insensitive comparison (Windows)
+    std::transform(normalized.begin(), normalized.end(), normalized.begin(),
+        [](unsigned char c) { return std::tolower(c); });
+
+    return normalized;
+}
+
+// Compare two paths for equality
+bool CreoUtilities::PathsAreEqual(const std::string& path1, const std::string& path2) {
+    // Both empty
+    if (path1.empty() && path2.empty()) {
+        return true;
+    }
+
+    // One empty, one not
+    if (path1.empty() || path2.empty()) {
+        return false;
+    }
+
+    // Compare normalized paths
+    std::string norm1 = NormalizePath(path1);
+    std::string norm2 = NormalizePath(path2);
+
+    return norm1 == norm2;
+}
diff --git a/CreoUtilities.h b/CreoUtilities.h
new file mode 100644
index 0000000..481829e
--- /dev/null
+++ b/CreoUtilities.h
@@ -0,0 +1,47 @@
+#pragma once
+
+// Creo OTK headers
+#include <pfcGlobal.h>
+#include <pfcSession.h>
+#include <wfcSession.h>
+#include <pfcExceptions.h>
+
+// Standard library headers
+#include <string>
+#include <algorithm>
+
+// Working directory change result structure
+struct ChangeDirectoryResult {
+    bool success = false;
+    std::string original_directory;   // Original working directory before operation
+    std::string target_directory;      // Target directory requested by user
+    std::string current_directory;     // Actual working directory after operation
+    bool directory_changed = false;    // Whether directory was actually changed
+    std::string message;               // Success message or informational text
+    std::string error_message;         // Error details if operation failed
+};
+
+// Creo Utilities - Common utility functions for Creo operations
+class CreoUtilities {
+public:
+    // Set Creo working directory
+    // Only changes directory if target is different from current directory
+    // Parameters:
+    //   target_directory - The desired working directory path
+    // Returns:
+    //   ChangeDirectoryResult with detailed operation status
+    static ChangeDirectoryResult SetWorkingDirectory(const std::string& target_directory);
+
+private:
+    // Private constructor - this is a static utility class
+    CreoUtilities() = delete;
+    ~CreoUtilities() = delete;
+    CreoUtilities(const CreoUtilities&) = delete;
+    CreoUtilities& operator=(const CreoUtilities&) = delete;
+
+    // Helper methods for internal use
+    static std::string XStringToString(const xstring& xstr);
+    static xstring StringToXString(const std::string& str);
+    static std::string NormalizePath(const std::string& path);
+    static bool PathsAreEqual(const std::string& path1, const std::string& path2);
+};
diff --git a/MFCCreoDll.vcxproj b/MFCCreoDll.vcxproj
index b922c07..6b092cd 100644
--- a/MFCCreoDll.vcxproj
+++ b/MFCCreoDll.vcxproj
@@ -209,6 +209,7 @@ ws2_32.lib;%(AdditionalDependencies)</AdditionalDependencies>
     <ClCompile Include="AuthManager.cpp" />
     <ClCompile Include="ComponentChildrenManager.cpp" />
     <ClCompile Include="CreoManager.cpp" />
+    <ClCompile Include="CreoUtilities.cpp" />
     <ClCompile Include="GeometryAnalyzer.cpp" />
     <ClCompile Include="HierarchyStatisticsAnalyzer.cpp" />
     <ClCompile Include="HttpRouter.cpp" />
@@ -240,6 +241,7 @@ ws2_32.lib;%(AdditionalDependencies)</AdditionalDependencies>
     <ClInclude Include="ComponentChildrenManager.h" />
     <ClInclude Include="Config.h" />
     <ClInclude Include="CreoManager.h" />
+    <ClInclude Include="CreoUtilities.h" />
     <ClInclude Include="framework.h" />
     <ClInclude Include="GeometryAnalyzer.h" />
     <ClInclude Include="HierarchyStatisticsAnalyzer.h" />
diff --git a/MFCCreoDll.vcxproj.filters b/MFCCreoDll.vcxproj.filters
index d1b8de4..c08c2a0 100644
--- a/MFCCreoDll.vcxproj.filters
+++ b/MFCCreoDll.vcxproj.filters
@@ -93,6 +93,9 @@
     <ClCompile Include="ComponentChildrenManager.cpp">
       <Filter>源文件\src\creo</Filter>
     </ClCompile>
+    <ClCompile Include="CreoUtilities.cpp">
+      <Filter>源文件\src\utils</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <None Include="MFCCreoDll.def">
@@ -178,6 +181,9 @@
     <ClInclude Include="ComponentChildrenManager.h">
       <Filter>源文件\src\creo</Filter>
     </ClInclude>
+    <ClInclude Include="CreoUtilities.h">
+      <Filter>源文件\src\utils</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="MFCCreoDll.rc">