Revision of a course : how to keep the same Manifest ?

Dear all,

When publishing a new version of a SCORM course, is there a way to keep the same imsmanifest.xml ?

Here is the situation.

We built a course which is already in use on our client's LMS.

They want to change a picture (which is on a layer). We used the "Change Picture" function"

The new SCORM course has a slightly different imsmanifest.xml : the .swf related to the image has changed.

As their LMS requires exactly the same imsmanifest.xml, how can we deal with this requirement ?

Thank you for your help.