Your instructions for this file The Windows XP Device Manager Error Codes Help file contains descriptions and troubleshooting tips for 32 Windows XP Device Manager error codes. Because many antivirus programs automatically filter out CHM files, we have renamed the XP DevMgr Error Codes.chm file to XP DevMgr Error Codes.txt for this download. Once you download and unzip the file you will need to rename the .txt file to XP DevMgr Error Codes.chm. Then simply double-click the .chm file and you’ll be off and running. I’m not able to open this file, windows automatically adds .txt to the end of this file. It’s name is XP DevMgr Error Codes.chm.txt now. How do I correct this?