Cannot open muse file Error Assert: "Corrupt XML in database record U1 class MuseSite"

Question

I cannot open the .muse file.  The site was saved as a .muse the saved as html and uploaded to web.  Customer has a change and the .muse file will not open.  The error I get is Error Assert: "Corrupt XML in database record U1 class MuseSite".  How can this be fixed? What happened? Please help. I took the html version to DreamWeaver but it is very discombobulated on the design screen and strange coding on the code view.  Please help, customer needs this change asap.
The error from the muse log is : 
Build 8: Sun Jun 9 12:23:11 2013 UTC: Assert: Corrupt XML in database record U1 class MuseSite-DataBase/createPersistFromDataBaseRecord+DataBase/instantiate+DataBase/getRootPe rsist+DocumentConversion$/runConversion+DataBase/open+MuseSite$/openSite+NativeOpenProvide r/openThisFile+MuseImportManager/processFile+MuseImportManager/selectMultipleFilesHandler+ end stack
Build 8: Sun Jun 9 12:23:11 2013 UTC: EXCEPTION:TypeError: Error #1095: XML parser failure: Unterminated attribute.-DataBase/createPersistFromDataBaseRecord+DataBase/instantiate+DataBase/getRoot Persist+DocumentConversion$/runConversion+DataBase/open+MuseSite$/openSite+NativeOpenProvi der/openThisFile+MuseImportManager/processFile+MuseImportManager/selectMultipleFilesHandle r+end stack

Answer 1

I sent you the file and the info concerning where the file was stored via email.  I am posting that info here as well.
You Asked:
The object that's reporting as damaged is a very important one. We may, or may not, be able to repair the file.
Was the file stored in a shared folder (i.e. Dropbox, Creative Cloud Files, Box, etc.)? No
Was it stored on a file server that was accessed from two separate copies of Muse? No
The file was stored  on my personal Network Storage unit utilizing  an Intellinet NAS with 2 1.5TB drives in a raid array. The file was created on  a Mac Pro v 10.6.8
  Model Name:    Mac Pro
  Model Identifier:    MacPro4,1
  Processor Name:    Quad-Core Intel Xeon
  Processor Speed:    2.66 GHz
  Number Of Processors:    1
  Total Number Of Cores:    4
  L2 Cache (per core):    256 KB
  L3 Cache:    8 MB
  Memory:    8 GB
  Processor Interconnect Speed:    4.8 GT/s