System.IO.IOException: Invalid key specification in .reg, line 3

[Lavshyak]

In Cklutz.RegFile 1.0.9 nuget.org and in cloned this repository.

using RegFile;

using var reader = new RegFileReader("C:\\CodeProjects\\NET\\RegCSVToReg\\FullReester.reg");
var commands = reader.Read(); //exception

System.IO.IOException: Invalid key specification in C:\CodeProjects\NET\RegCSVToReg\FullReester.reg, line 3
   at RegFile.RegFileExtensions.ParseException(SourceLocation location, String msg)
   at RegFile.RegFileExtensions.SplitIntoHiveAndSubKey(ReadOnlySpan`1 span, SourceLocation sourceLocation)
   at RegFile.RegFileReader.Read()
   at Program.<Main>$(String[] args) in C:\CodeProjects\NET\RegCSVToReg\RegCSVToReg\Program.cs:line 4

first part of FullReester.reg (exported by windows 10 registry editor) (line 3 is [HKEY_LOCAL_MACHINE]):

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE]

[HKEY_LOCAL_MACHINE\BCD00000000]

[HKEY_LOCAL_MACHINE\BCD00000000\Description]
"KeyName"="BCD00000000"
"System"=dword:00000001
"TreatAsSystem"=dword:00000001
"GuidCache"=hex:23,1e,b1,3d,97,2b,db,01,0a,27,00,00,10,ec,00,0c,29,13,24,13,76,\
  00,00,00

[HKEY_LOCAL_MACHINE\BCD00000000\Objects]

SplitIntoHiveAndSubKey method tries to split HKEY_LOCAL_MACHINE, but there is no sub key.

[Lavshyak]

possible fiix (.net8 windows target, nullable enabled):

RegistrySubKeyCommand.cs:11
public string? SubKey { get; set; }

RegFileReader.cs:117
(var hive, string? subKeyName) = subkey.SplitIntoHiveAndSubKey(sourceLocation);

RegFileExtensions:14

public static (RegistryHive, string?) SplitIntoHiveAndSubKey(this ReadOnlySpan<char> span, SourceLocation sourceLocation)
        {
            int pos = span.IndexOf('\\');
            if (pos == -1)
            {
                var hive1 = StringToHive(span.ToString());
                if(hive1.HasValue)
                    return (hive1.Value, null);
                
                throw sourceLocation.ParseException("Invalid key specification");
            }