I used to be able to open the chm electronic tutorial in Windows 2000, but since I installed Windows 2003, I found that it no longer works. I always thought that the file might be damaged. I thought about it again today and searched online, and finally found the solution: open the chm file with the right click. Properties, you will find an additional "Security" item at the bottom of the "General" tab. Click "Unlock" and confirm, and you will find that it can be opened normally.
It is said online that it is caused by Microsoft not supporting chm format help files starting from Windows 2003. I couldn't find any relevant instructions on MSDN. I will just solve it like this for now, haha.
