If you want to add this text 'c: \program files\..' change this line
Code:
LabelCurrFileName.Caption: = ExpandConstant ('{cm: ExtractedFile}') + MinimizePathName (currentfile, LabelCurrFileName.Font, LabelCurrFileName.Width-ScaleX (100));
to
Code:
LabelCurrFileName.Caption: = ExpandConstant ('{cm: ExtractedFile}') + ExpandConstant('{app}\') + MinimizePathName (currentfile, LabelCurrFileName.Font, LabelCurrFileName.Width-ScaleX (100));
.