It returns the following info (samples for W95 and W98)

...
ProductName: Microsoft Windows 95
Version: Windows 95
VersionNumber: 4.00.1111
SubVersionNumber: B
...

...
ProductName: Microsoft Windows 98
Version: Windows 98
VersionNumber: 4.10.2222
SubVersionNumber: A
...

Here is the full script I collect, you can cut whatever you like.

;-----------------------------------
$Key="HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion"

? "ProductType: "+Readvalue ($key,"ProductType")
? "RegisteredOwner: "+Readvalue ($key,"RegisteredOwner")
? "RegisteredOrganization: "+Readvalue ($key,"RegisteredOrganization")
? "ProductId: "+Readvalue ($key,"ProductId")
? "LicensingInfo: "+Readvalue ($key,"LicensingInfo")
? "SystemRoot: "+Readvalue ($key,"SystemRoot")
? "ProductName: "+Readvalue ($key,"ProductName")
? "Version: "+Readvalue ($key,"Version")
? "VersionNumber: "+Readvalue ($key,"VersionNumber")
? "SubVersionNumber: "+Readvalue ($key,"SubVersionNumber")
? "Plus! VersionNumber: "+Readvalue ($key,"Plus! VersionNumber")
? "FirstInstallDateTime: "+Readvalue ($key,"FirstInstallDateTime")
? "BootCount: "+Readvalue ($key,"BootCount")
? "ProductKey [98]: "+Readvalue ($key,"ProductKey")

$Key=HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\ComputerName\ComputerName
? "ComputerName [CN]: "+Readvalue ($key,"ComputerName")

$Key=HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\VNETSUP
? "ComputerName [Sr]: "+Readvalue ($key,"ComputerName")
? "Workgroup: "+Readvalue ($key,"Workgroup")
? "Comment: "+Readvalue ($key,"Comment")