Please open a new case for this, and just attach the mathcad file. No need to use an archive.
In the future please avoid multiple posts with the same question and open a new thread rather than extending an old existing one.
I was having trouble with a Mathcad file that got corrupted late last night.
Would you be willing to help me restore it?
I'd really appreciate it.
Notice that the Sheetviewer (https://community.ptc.com/t5/PTC-Mathcad/Can-t-see-your-sheet-but/m-p/636482 ) can still display the contents, sort of.
What's the error message that Mathcad gives you?
(Specifically, does it give you a location?)
It says, "Element content is invalid according to the DTD/Schema"
Line number 6369
Character position 19