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Migration Delphi 7 To Delphi XE3

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Hello,

I have a project has just been migrated from delphi 7 to delphi XE3.
In compile still has some 4000 warnings:

Example:

Warnings:

W1050 WideChar reduced to byte char in set expressions. Consider using CharInSet function in SysUtils unit.
W1058 Implicit string cast with potential data loss from string to AnsiString
W1057 Implicit string cast from AnsiString to string
W1044 Suspicious typecast of string to PAnsiChar

I did not correct these warnings because I didn't have problems with the strings in the project,
but is worried whether this will affect the current code.

Thanks

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