Created README.md

README.md

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+# SharePoint XLS to XLSX Converter
+
+This tool allows you to convert legacy `.xls` files stored in SharePoint to the modern `.xlsx` format. The converter maintains the original folder structure and automatically uploads the converted files back to SharePoint.
+
+## Installation Instructions
+
+### Step 1: Install PowerShell 7.5
+
+1. Visit the [PowerShell GitHub releases page](https://github.com/PowerShell/PowerShell/releases)
+2. Download the appropriate installer for your system (e.g., `PowerShell-7.5.0-win-x64.msi` for 64-bit Windows)
+3. Run the installer and follow the on-screen instructions
+4. Verify the installation by opening PowerShell 7 from the Start menu
+
+### Step 2: Install Required Dependencies
+
+1. Download the XLS to XLSX Converter files to a folder on your computer
+2. Right-click on PowerShell 7 in the Start menu and select "Run as administrator"
+3. Navigate to the folder containing the converter files:
+   ```
+   cd C:\path\to\XLS_to_XLSX
+   ```
+4. Run the dependency installer script:
+   ```
+   .\Install-Dependencies.ps1
+   ```
+5. The script will install the required Microsoft Graph modules and verify that Excel is installed
+
+### Step 3: Configure Microsoft Graph Authentication
+
+1. The first time you run the application, you'll need to authenticate with Microsoft Graph
+2. Follow the prompts to sign in with your Microsoft 365 account that has access to the SharePoint site
+
+## Operating the Program
+
+### Starting the Application
+
+1. Open PowerShell 7 as administrator
+2. Navigate to the application folder:
+   ```
+   cd C:\path\to\XLS_to_XLSX
+   ```
+3. Run the application in STA mode:
+   ```
+   pwsh -STA -File .\MainForm.ps1
+   ```
+
+### Using the Application
+
+1. **Configure SharePoint Settings**:
+   - Enter your SharePoint site URL (e.g., `https://yourcompany.sharepoint.com/sites/yoursite`)
+   - Enter the document library name (e.g., `Shared Documents` or `Documents`)
+   - Click "Save Config" to save these settings for future use
+
+2. **Connect to SharePoint**:
+   - Click the "Connect" button to authenticate with SharePoint
+   - Follow any authentication prompts that appear
+
+3. **Select a Folder** (Optional):
+   - Click "Browse" to navigate to a specific folder in SharePoint
+   - If no folder is selected, the application will work with files in the root of the document library
+
+4. **List XLS Files**:
+   - Click "List XLS Files" to find all `.xls` files in the selected location
+   - The files will be displayed in the grid at the bottom of the window
+
+5. **Convert Files**:
+   - Click "Convert to XLSX" to begin the conversion process
+   - The application will:
+     - Download each `.xls` file
+     - Convert it to `.xlsx` format using Excel
+     - Upload the converted file back to the same location in SharePoint
+   - Progress and status messages will appear in the text box on the right
+
+## Troubleshooting
+
+- **Authentication Issues**: Ensure you have the correct permissions to access the SharePoint site
+- **Excel Errors**: Make sure Microsoft Excel is installed and properly licensed
+- **File Access Errors**: Check that you have permission to read and write to the SharePoint libraries
+- **Conversion Failures**: Some very old or complex Excel files may not convert properly
+
+## Notes
+
+- The application requires an active internet connection
+- Large files may take longer to download, convert, and upload
+- The original `.xls` files remain unchanged in SharePoint 

SharePointFunctions.ps1

@@ -318,8 +318,8 @@ function Get-XlsFilesCurrentFolder {
     foreach ($item in $items) {
         $script:txtStatus.Text += "Checking item: $($item.Name)`n"
         
-        # If it's an Excel file, add it to the list
-        if ($item.Name -like "*.xls" -or $item.Name -like "*.xlsx" -or $item.Name -like "*.xlsm") {
+        # If it's an Excel file, add it to the list - only .xls files, not .xlsx
+        if ($item.Name -like "*.xls" -and -not ($item.Name -like "*.xlsx")) {
             $script:txtStatus.Text += "Found XLS file: $($item.Name)`n"
             $allFiles += [PSCustomObject]@{
                 OriginalPath = $item.WebUrl