Import-MarkdownCommandHelp does not resolve paths correctly in Windows PowerShell

Prerequisites

• Write a descriptive title.
• Make sure you are able to repro it on the latest version
• Search the existing issues.

Steps to reproduce

In Windows PowerShell if I try to import markdown files from the pipeline I experience this:

PS C:\Windows\system32> ls 'C:\Users\Martin\source\repos\MouseSettings\Docs' -Recurse -Filter *.md | Import-MarkdownCommandHelp
Import-MarkdownCommandHelp : Cannot find path 'C:\Windows\system32\Get-MouseSettings.md' because it does not exist.
At line:1 char:78
+ ... ouseSettings\Docs' -Recurse -Filter *.md | Import-MarkdownCommandHelp
+                                                ~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.String[]:String[]) [Import-MarkdownCommandHelp], ItemNotFoundException
    + FullyQualifiedErrorId : Could not resolve Path,Microsoft.PowerShell.PlatyPS.ImportMarkdownHelpCommand

Import-MarkdownCommandHelp : Cannot find path 'C:\Windows\system32\Set-MouseSettings.md' because it does not exist.
At line:1 char:78
+ ... ouseSettings\Docs' -Recurse -Filter *.md | Import-MarkdownCommandHelp
+                                                ~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.String[]:String[]) [Import-MarkdownCommandHelp], ItemNotFoundException
    + FullyQualifiedErrorId : Could not resolve Path,Microsoft.PowerShell.PlatyPS.ImportMarkdownHelpCommand

PS C:\Windows\system32>

Note how it tries to find the file names in the current directory. If I do the same from PowerShell 7 it works perfectly fine:

PS C:\Windows\System32> ls 'C:\Users\Martin\source\repos\MouseSettings\Docs' -Recurse -Filter *.md | Import-MarkdownCommandHelp

Title             ModuleName    Synopsis
-----             ----------    --------
Get-MouseSettings MouseSettings Gets all the current mouse settings that this module can manage.
Set-MouseSettings MouseSettings Sets various mouse settings.

PS C:\Windows\System32>

Expected behavior

It finds the files from pipeline input like so:

PS C:\Windows\System32> ls 'C:\Users\Martin\source\repos\MouseSettings\Docs' -Recurse -Filter *.md | Import-MarkdownCommandHelp

Title             ModuleName    Synopsis
-----             ----------    --------
Get-MouseSettings MouseSettings Gets all the current mouse settings that this module can manage.
Set-MouseSettings MouseSettings Sets various mouse settings.

Actual behavior

It throws an error because it's trying to find files in the wrong directory:

PS C:\Windows\system32> ls 'C:\Users\Martin\source\repos\MouseSettings\Docs' -Recurse -Filter *.md | Import-MarkdownCommandHelp
Import-MarkdownCommandHelp : Cannot find path 'C:\Windows\system32\Get-MouseSettings.md' because it does not exist.
At line:1 char:78
+ ... ouseSettings\Docs' -Recurse -Filter *.md | Import-MarkdownCommandHelp
+                                                ~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.String[]:String[]) [Import-MarkdownCommandHelp], ItemNotFoundException
    + FullyQualifiedErrorId : Could not resolve Path,Microsoft.PowerShell.PlatyPS.ImportMarkdownHelpCommand

Import-MarkdownCommandHelp : Cannot find path 'C:\Windows\system32\Set-MouseSettings.md' because it does not exist.
At line:1 char:78
+ ... ouseSettings\Docs' -Recurse -Filter *.md | Import-MarkdownCommandHelp
+                                                ~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.String[]:String[]) [Import-MarkdownCommandHelp], ItemNotFoundException
    + FullyQualifiedErrorId : Could not resolve Path,Microsoft.PowerShell.PlatyPS.ImportMarkdownHelpCommand

PS C:\Windows\system32>

Error details

Environment data

Name                           Value
----                           -----
PSVersion                      5.1.26100.7920
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.26100.7920
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

Version

1.0.1

Visuals

No response

Start with the Import-MarkdownCommandHelp entry point and reproduce the pipeline behavior in Windows PowerShell 5.1 and PowerShell 7 using the commands and paths shown. Trace how pipeline input is resolved and compare the resulting paths between versions. Done means the Windows PowerShell invocation resolves the supplied Markdown files instead of searching the current directory.