Some .CHM files may not render properly on Windows Vista and Windows 7
When attempting to open a Compiled HTML Help (.CHM) file on Windows Vista or Windows 7, the file may open but display one of the following message instead of the expected content:
- Navigation to the webpage was canceled.
- Action canceled.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2021383.