CHM Permissions


Good News! The SPC Express help screens have been completely re-written from the "HLP" format to the new "CHM" format. CHM Help screens are supported by all versions of Windows including Windows 10. You'll need to get the latest version of SPC Express (June 9, 2017 or newer).

You may encounter one small glitch, however. By default (it seems) Microsoft prevents you from viewing CHM help files unless they reside on your local C drive. If your help file (Expwin.CHM) is on your server, Windows will display the help window with the directory tree in the left-hand pane, but the right-hand pane containing the detail descriptions will be blank!

To correct this glitch, you may need to lower the restrictions on the Local Intranet zone to allow server-based CHM files to be displayed with the following steps:
  1. Click Start (on Windows 10, right-click), click Run, type regedit to launch the Registry Editor, 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.
When editing the Key in RegEdit, your screen should look like this: