converting Delphi 5 to Delphi 2010 code ?

When compiling my Delphi 5 code in Delphi 2010, i receive the following error messsages

1.)

Implicit string cast from 'ShortString' to 'string'

it occure on the following routine

CompareText(PropInfo^.Name, P^.PropertyName)


how to fix??

2.)

 Incompatible types: 'Char' and 'AnsiChar'

it occure on the following

 if winexec(pchar(key),show)<32 then
        raise exception.create('Couldn''t launch default browser');

how to fix?
DelphiRulezAsked:
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DelphiRulezAuthor Commented:
i added second question and raised points to 500
Mahdi78Commented:
use Ansichar instead of Char, Ansistring instead of String and PAnsichar instead of Pchar

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