Hello Vicky, welcome here!
A LDraw file is pure text. So you can use a plain text editor (such as Windows notepad) to repair your file. Alternatively you could use a specialized LDraw text editor such as LDraw Design Pad (http://lddp.sourceforge.net/) which offers syntax highlighting.
A LDraw file is pure text. So you can use a plain text editor (such as Windows notepad) to repair your file. Alternatively you could use a specialized LDraw text editor such as LDraw Design Pad (http://lddp.sourceforge.net/) which offers syntax highlighting.