Why did you save the document into .doc instead of .odt? I think you want to open the document in MS Word as well, it seems to be the only reason behind this. The file is saved in .doc extension, so this could be a plus point here. You must be MS Office Word user since you saved the document in .doc. You must give a try to Open and Repair of MS Word. By doing this you can fix corrupted document. If this doesn't help, then you can go for a third-party recovery software. On Google you'll get a wide range of MS Word Doc recovery software, choose any reliable one and check its demo version first. I can recommend you to check the free demo version of SysInfoTools MS Word Doc Recovery
software. I have used a couple of times.