The system cannot find the path specified - executeShell fails when there's a invalid windows registry

[dlangBugzillaToGithub]

macoovacany reported this on 2021-11-04T13:59:40Z

Transfered from https://issues.dlang.org/show_bug.cgi?id=22479

Description

Issue:
After downloading and installing a fresh dmd installation for a Windows machine, I tried running a basic dub build but it failed with the error:

"Failed to invoke the compiler c:\d\dmd\windows\bin\dmd.exe to determine the build platform:The system cannot find the path specified."

<note: I might have the compiler path wrong because I also tried an LDC install. The compiler error is from dub, https://github.com/dlang/dub/blob/master/source/dub/compilers/compiler.d Line 134 >

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Cause:
The windows registry key "HKEY_CURRENT_USER\Software\Microsoft\Command Processor\AutoRun" had an invalid path. Removing the invalid value allowed dub to build correctly.

Refer https://stackoverflow.com/questions/33638281/what-is-the-reason-for-the-error-message-system-cannot-find-the-path-specified

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Suggestion:
1) Provide documentation to this possible cause and fix. 
2) Perform a check in the phobos std.process.executeShell() if the system returns this error. 

OK to close this issue as fixed.