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WritePackageDefW fails when the Visual Studio installation path contains spaces (ERROR_INVALID_NAME) #329

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@user76-real

Hi,
I found an issue with WritePackageDefW when installing VisualD.

The installer executes the following command:
rundll32.exe "C:\Program Files (x86)\VisualD\visuald.dll",WritePackageDefW "SOFTWARE\Microsoft\VisualStudio\18.0" "C:\Program Files (x86)\Microsoft Visual Studio\18\BuildTools"

Instead of completing successfully, VisualD displays the following Windows error:
"The filename, directory name, or volume label syntax is incorrect."
(Error 123 / ERROR_INVALID_NAME)

After inspecting the source code, WriteExtensionPackageDefinition() splits the command line at the first space and then directly uses the second argument as a file path:

auto idx = indexOf(wargs, ' ');
registryRoot = (wargs[0 .. idx] ~ "\0"w)[0 .. idx];
string fname = to!string(wargs[idx + 1 .. $]);

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