Calendar Attachment size

Am trying to add attachment to calendar object using the below code

MapiCalendar f_MapiCalendarObj = null;
byte[] array = File.ReadAllBytes(Attachment_Path);
f_MapiCalendarObj.Attachments.Add(“displayname”, array);

In this case after saving the appointment in PST file attachment size is showing the size of the attachment(Not the size on disk ).
In my case i have a very significant difference in size and size on disk.
Is there any way to set the size on disk value as attachment size after saving in PST ?

@Shital_diwate,

I am afraid that no such option is available where attachment size can be set manually. Please feel free to write us back if you have any other query in this regard.

Okay.Thank you for the information.

You are welcome.