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It seems to use whatever you put into the format string. My expectation was that it replaces the dot with the current DecimalSeparator, which would be logical as secs/msecs are decimals, but that isn't the case. After some searching I wasn't able to find some docs for milliseconds in local time formats. There are only international norms. I suggest to file a bug report and see what they have to say about it.

I found that the other way round it uses a dot when formatting the milliseconds. So either way is obviously wrong.

Why are you using AnsiString at all? You should be using (Unicode)String instead, since that is what the TMemo expects. In any case, Char is WideChar in D2009+, so SizeOf(Char) is 2 not 1, so you are allocating memory for your AnsiString for only 1/2 of the file data, but then reading the full file into that memory. So you are going to corrupt surrounding memory. Use SizeOf(AnsiChar) instead, which is 1 so you can just drop the SizeOf() altogether. var LoadString: AnsiString; FS: TFileStream; begin FS := TFileStream.Create(FileName, fmOpenRead or fmShareDenyNone); try SetLength(LoadString, FS.Size); FS.ReadBuffer(Pointer(LoadString)^, FS.Size); finally FS.Free; end; Memo.Lines.Add(String(LoadString)); end; Alternatively, there are other options, such as TMemoryStream.LoadFromFile(): uses System.Classes; var LoadString: AnsiString; MS: TMemoryStream; begin MS := TMemoryStream.Create; try MS.LoadFromFile(FileName); SetString(LoadString, PAnsiChar(MS.Memory), MS.Size); finally MS.Free; end; Memo.Lines.Add(String(LoadString)); end; Or TStreamReader: uses System.Classes, System.SysUtils; var LoadString: String; Reader: TStreamReader; begin Reader := TStreamReader.Create(FileName, TEncoding.ANSI); try LoadString := Reader.ReadToEnd; finally Reader.Free; end; Memo.Lines.Add(LoadString); end; Or TFile.ReadAllText(): uses System.IOUtils, System.SysUtils; var LoadString: String; begin LoadString := TFile.ReadAllText(FileName, TEncoding.ANSI); Memo.Lines.Add(LoadString); end;