CHM Compiled Help files all give - NOT FOUND error

Solution 1:

I have this sometimes and what fixes it for me is right clicking the file, then clicking the unblock button.

If this is a .chm file from another machine, it has a NTFS flag set for downloading. Clicking this button clears the flag.

I have no idea why other files work but for some reason, .CHM files are affected... I guess it is to do with the way it caches the html pages.

Solution 2:

In addition to the blocking "feature" Wil noted, a few years ago, microsoft released a security update that prevents chm files from executing from remote drives. If thisis your problem, you can copy it locally or lower the restrictions on the Local Intranet zone to allow CHM files to be displayed:

1. Click Start, click Run, type regedit, and then click OK.

2. Locate and then click the following subkey: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\ItssRestrictions If this registry subkey does not exist, create it.

3. Right-click the ItssRestrictions subkey, point to New, and then click DWORD Value.

4. Type MaxAllowedZone, and then press Enter.

5. Right-click the MaxAllowedZone value, and then click Modify.

6. In the Value data box, type 1, and then click OK.

7. Quit Registry Editor.