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You are here: Home / Coding / Refreshing the cached installed files of Visio

Published on August 6, 2024 by David Parker

Refreshing the cached installed files of Visio

I have created many Visio solutions over the past 25 years and used a number of methods of creating an installation that includes Visio templates and stencils. I have just wasted many hours trying to debug an installation created with Advanced Installer until I realised that the problem was that Visio was not properly updating the cache of installed templates and stencils. In the end, the answer was to delete the cache and let Visio re-create it. The screenshots below show the custom shapes opened with the custom template and the More Shapes context menu. Before I deleted the cache, Visio incorrectly displayed the file name of some of the stencils (those with a trailing “_M” ) rather than the display name as entered into the PublishComponent table in Advanced Installer. In addition, the context menu did not show those stencils as being present in the workspace.

  • Before deleting the cache
  • After deleting the cache

I realised that the problem stencils were those that contains Norwegian characters not found in English, and they had been problematic previously, so I tried editing my setup files many times, switching between English and Norwegian, but nothing worked. Actually it was working on my 64bit Visio installation but not on my 32bit Visio installation.

Visio has two files that it creates or updates on close. This is content16.dat and thumbs.dat which typically can be found in C:\Users\<username>\AppData\Local\Microsoft\Visio. One holds the information about each installed template and stencil and this was not getting updated. The other holds the preview images. Content16.dat can safely be deleted with Visio closed, because Visio will recreate it when it is opened, and saved to file when it is closed.

  • The location of content16.data
  • A peek inside content16.dat

So, this solved the issue, but it is not a complete solution because the installer should cause this to refresh. To date I have been using a Custom Action in Advanced Installer that, I thought, would force this refresh. This vbscript bumps up the value of the ConfigChangeID in the registry.

Dim WshShell, visChangeId 
Set WshShell = CreateObject("WScript.Shell") 
On Error Resume Next 
visChangeId = WshShell.RegRead ("HKLM\Software\Microsoft\Office\Visio\ConfigChangeID")
If Err = 0 Then WshShell.RegWrite "HKLM\Software\Microsoft\Office\Visio\ConfigChangeID", visChangeId + 1, "REG_DWORD"

However, I have recently been getting warnings in Advanced Installer that vbscript is being phased out. So perhaps that was the root cause of the problem. Fortunately Advanced Installer can use JavaScript as an alternative, so I will now try to replace the above script with the following:

const { execSync } = require('child_process');

try {
    const visChangeId = execSync('reg query "HKLM\\Software\\Microsoft\\Office\\Visio" /v ConfigChangeID').toString().match(/ConfigChangeID\s+REG_DWORD\s+(\d+)/)[1];
    const newVisChangeId = parseInt(visChangeId) + 1;
    execSync(`reg add "HKLM\\Software\\Microsoft\\Office\\Visio" /v ConfigChangeID /t REG_DWORD /d ${newVisChangeId} /f`);
} catch (error) {
    // Handle error if needed
}

Back to project work ….

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Filed Under: Coding, Deployment, Visio, Visio for Desktop Tagged With: AdvancedInstaller, Setup and Deployment, Visio

About David Parker

David Parker has 25 years' experience of providing data visualization solutions to companies around the globe. He is a Microsoft MVP and Visio expert.

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