Resolving .chm file error in RoboHelp: Cannot open file: mk:@MSITStore”

If you are working with Microsoft HTML Help in RoboHelp, you might get the following error while opening the .chm file:

CHM Error Message
CHM Error Message

This error usually occurs due to HHCTRL.OCX file which is a Windows file used to view help files. Most of the times it gets overwritten by some newly installed hardware, software or even updates. You can try one of the following steps to resolve this issue:

  • Restore the previous version of HHCTRL.OCX. You can do so by restoring your system to a system restore point or copying it from the windows installation disk.
  • Try replacing the HHCTRL.OCX file from a system on which you are able to open the .chm file successfully.
  • Register the HHCTRL.OCX file by running the following command:

    Run Command dialog box
    Run Command dialog box

Submitted by: Piyush Bhatnagar, Asst Manager Tech Support


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Nandini Gupta

Nandini Gupta is a Senior Content and Community Manager planning and delivering documentation for a wide range of Adobe products, including Creative Cloud, Photoshop, Lightroom, Elements, and FrameMaker. The web and its many forms of communication fascinate her. Whether it is technology, communication, or life, her vote is for a simple magical experience.

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