I am running Excel 2010 and have been working on files and ONLY saving them to my USB memory stick.
On connecting the device to my PC (using an extension USB cord) I noticed a very brief minute blue like spark, and didn'y release until I tried to access my files that the entire content was wiped.
Painstakingly, I found some recovery software and was able to recover documents. Of all the Excel docs, all but 4 will re-open. Yes the ones I need. the message reads :
Excel cannot open the file 'LostFile_XLSX_608879.xlsx' because the file format or file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file.
Well I think it looks fine to me, and I endeavoureed to use the Open & Repair when openng the file too, with no luck.
Please can you help and tell me all is not lost.
Thanks