What is Recover and how does it work?

Recover command allows a document that cannot be opened.
Full recovery and correction of all errors are not guaranteed.
After command launch, a standard dialog box to open a file appears, you have to select the folder and the name of the damaged file and after that click the Open button.
The report is shown in the command line and is similar to the report of the Audit command:

AcDbLine (117689). Error:: Inactive XData handle (1157FE) was found.
Audit: Invalid.
Fixed:: Replaced: Set to Null.

AcDbArc(11768A). Error:: Inactive XData handle (1157FE) was found.
Audit: Invalid.
Fixed:: Replaced: Set to Null.

AcDbCircle(119E1F). Error:: Inactive Z coordinate - 1e+100 was found.
Audit: Invalid.
Fixed:: Replaced: Set to 0.