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Cannot open the file: mk:@MSITStore:C:\Program Files\..\RockWorks14.chm

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We've had rare occasions when customers report the following error message when trying to open the RockWorks help CHM file, either via the program's menus or by simply double-clicking on the CHM file itself:

Cannot open the file: mk:@MSITStore:C:\Program Files\RockWare\Help\RockWorks14.chm

Searches on the web indicate that this may be caused by the Windows file "Hhctrl.ocx", which is required to display the compressed HTML help file, being unregistered in the operating system as a result of another software program being un-installed.

A possible solution is to re-register the file in Windows by typing the following into a command prompt:

regsvr32 %systemroot%\system32\hhctrl.ocx

This should deliver a message like, "DllRegisterServer in C:\Windows\system32\hhctrl.ocx succeeded"

Other postings indicate that simply placing a copy of the hhctrl.ocx file right in the C:\Program Files\RockWare\Help\ folder can solve the problem. This file can usually be found in your Windows\system32 folder.

Molly Mayfield

RockWare Inc

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Another solution is to check the settings in the Windows Registry; these are for XP:




@="Compiled HTML Help file"




@=""C:\WINDOWS\hh.exe\" %1"

- - - - - - - - - - - - -

A quick web search for "File Association Fixes" resulted in a lot of pages with scripts which will reset your registry. Be careful.

Vista users may simply need to use Start / Default Programs / Associate A File Type or Protocol With a Program to set ".chm" files as associated with the Microsoft® HTML Help Executable (which is the "hh.exe" listed above).

XP users may simply need to reset .CHM files with HH.EXE using Windows Explorer/Tools/Folder Options.

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