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Microsoft HTML Help .chm file generation double in size and cannot open it (error mk:@MSITStore:)

Community Beginner ,
Nov 14, 2023 Nov 14, 2023

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I have been generating  Microsoft HTML Help (.chm file) and Resposive HTML5 successfully with Robohelp 2020.7.46 for my project. The last succesful .chm file that I generated was 98,611KB. After adding quite a bit of content (with new topics, excel files, images), I attempted to generate a .chm however the file was twice the size (196,792KB) and it will not open with error "Cannot open the file: mk:@MSITStore:C:\file). The Responsive HTML5 generation with the same project is successful without any issues. Has anyone seen this error with the .chm file generation?? After I deleted some of the data that I added, I was succesful in getting the file to generate. However, when I try to add new data (not the same as previous add) to the project, it fails again with the same error listed above. Is there a thereshold that I am not aware of??? Has anyone run into this issue?

 

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Community Expert ,
Nov 15, 2023 Nov 15, 2023

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Since CHMs are so antique, I had to google the error message you got - that revealed that the most common issue that causes that error is an offending graphics file. Next in popularity is a bad path/drive location; third is the use of any special characters not in the set of {A,B,C...x,y,z} and underscore; and lastly, a damaged HTML Help Workshop compiler.

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Community Expert ,
Nov 16, 2023 Nov 16, 2023

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See if this helps. https://community.adobe.com/t5/robohelp-discussions/chm-file-size-almost-doubled/m-p/874182#M35767. It's old but so are CHMs.

 

Also search on mk:@MSITStore. You will find lots of posts.

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My site www.grainge.org includes many free Authoring and RoboHelp resources that may be of help.

 

Help others by clicking Correct Answer if the question is answered. Found the answer elsewhere? Share it here. "Upvote" is for useful posts.

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Community Beginner ,
Nov 16, 2023 Nov 16, 2023

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Thank you both for your feedback jeff/Peter. Peter, I am using Robohelp 2020 and the majority of the references listed above are for older versions of Robohelp. I have tried creating a new HTML Help Output preset that points to a different output file location (no .chm files in the new location) however it still fails. I have also gone trough all files and images for any special characters but so far I have not found any. I do have many many images in the project and at this point I have tried removing all the images that I added after the last successful build but I'm still encountering the same issue. I have also tried building a .chm file with an earlier version of the project data and that builds just fine so the compiler must be OK. 

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Community Expert ,
Nov 16, 2023 Nov 16, 2023

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So it's definitely something you've added since to the project - I suspect you're going to have to brute-force it and add topics back in one at a time (compiling as you go) to find the offending element.

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Community Expert ,
Nov 17, 2023 Nov 17, 2023

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There will be on of the mk:@MSITStore posts that points to the answer but what @Jeff_Coatsworth has said does seem to be where the problem is.

________________________________________________________

My site www.grainge.org includes many free Authoring and RoboHelp resources that may be of help.

 

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