Initial commit - eDNC Special Character Fix

Real-time file watcher to strip invalid characters (0xFF, etc.)
from DNC program files for CNC machine compatibility.

Features:
- Monitors folder for .pun files (configurable)
- Automatically cleans files on create/modify
- Configurable character removal
- Retry logic for locked files
- Session statistics

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

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+# eDNC Special Character Fix
+
+Real-time file watcher that automatically removes invalid special characters from DNC (Direct Numerical Control) program files.
+
+## Problem
+
+Some legacy DNC systems and communication protocols add padding or termination bytes that modern CNC controllers cannot process correctly. Common problematic characters include:
+
+| Byte | Hex | Name | Description |
+|------|-----|------|-------------|
+| 255 | 0xFF | Fill | Padding/fill character |
+| 0 | 0x00 | NULL | Null character |
+| 26 | 0x1A | SUB | Ctrl+Z / EOF marker |
+| 127 | 0x7F | DEL | Delete character |
+
+## Solution
+
+This utility monitors a folder for DNC files and automatically strips specified characters as soon as files are created or modified.
+
+## Installation
+
+1. Copy the project folder to your DNC workstation
+2. Edit `eDNC-SpecialCharFix.ps1` to set your watch folder (default: `C:\Dnc_Files\Q`)
+3. Run `Run-eDNCFix.bat` or create a shortcut
+
+### Run at Startup (Optional)
+
+To run automatically at Windows startup:
+
+1. Press `Win + R`, type `shell:startup`, press Enter
+2. Create a shortcut to `Run-eDNCFix.bat` in the Startup folder
+
+## Usage
+
+### Basic Usage
+
+Double-click `Run-eDNCFix.bat` or run from PowerShell:
+
+```powershell
+.\eDNC-SpecialCharFix.ps1
+```
+
+### Custom Watch Folder
+
+```powershell
+.\eDNC-SpecialCharFix.ps1 -WatchFolder "D:\DNC\Programs"
+```
+
+### Different File Types
+
+```powershell
+.\eDNC-SpecialCharFix.ps1 -FileFilter "*.nc"
+```
+
+### Remove Additional Characters
+
+```powershell
+# Remove 0xFF, NULL, and SUB characters
+.\eDNC-SpecialCharFix.ps1 -CharactersToRemove @(255, 0, 26)
+```
+
+### All Options
+
+```powershell
+.\eDNC-SpecialCharFix.ps1 `
+    -WatchFolder "C:\Dnc_Files\Q" `
+    -FileFilter "*.pun" `
+    -IncludeSubfolders $true `
+    -CharactersToRemove @(255)
+```
+
+## Parameters
+
+| Parameter | Type | Default | Description |
+|-----------|------|---------|-------------|
+| WatchFolder | String | C:\Dnc_Files\Q | Folder to monitor |
+| FileFilter | String | *.pun | File pattern to watch |
+| IncludeSubfolders | Boolean | $true | Watch subdirectories |
+| CharactersToRemove | Int[] | @(255) | Byte values to strip |
+
+## Output
+
+The script displays real-time activity:
+
+```
+========================================
+ eDNC Special Character Fix v1.0.0
+========================================
+
+Configuration:
+  Watch Folder:    C:\Dnc_Files\Q
+  File Filter:     *.pun
+  Subfolders:      True
+  Removing bytes:  255 (0xFF)
+
+Watching for files... Press Ctrl+C to stop
+
+2025-12-12 08:30:15 | Created | PART001.pun
+  [CLEANED] Removed 3 byte(s)
+2025-12-12 08:30:22 | Changed | PART002.pun
+  [OK] No special characters found
+```
+
+## Requirements
+
+- Windows PowerShell 5.1 or later
+- Read/Write access to the watch folder
+
+## Troubleshooting
+
+### "Watch folder does not exist"
+Create the folder or specify a different path with `-WatchFolder`.
+
+### "File locked" errors
+The script retries up to 3 times if a file is locked. If errors persist, the file may be in use by another application.
+
+### Script doesn't detect files
+- Verify the file extension matches `-FileFilter`
+- Check that `-IncludeSubfolders` is set correctly
+- Ensure the script has permissions to the folder
+
+## Version History
+
+| Version | Date | Changes |
+|---------|------|---------|
+| 1.0.0 | 2025-12-12 | Initial release |
+
+## Author
+
+GE Aerospace - Rutland