Sometimes TikZEdt crashes because of some bugs in the program, and I did not save the source file.
Is there a way to recover the source code in that case?
Related questions:
conversion - Can I recover my .tex file? - TeX - LaTeX Stack Exchange
If you have the PDF file for some reason (quite unlikely with TikZEdt) that can be used with limited success.
editors - What You See is What You Get (WYSIWYG) for PGF/TikZ? - TeX - LaTeX Stack Exchange
TikZEdt is (at the time this post is written) unmaintained, the alternative is to use something else so it's less likely to crash again.