I am in desperate need of help. I had to format my computer hte other day and I backed up my files but now when i try to open a couple of very important excel documents i cannot get them to open. I get the following error:
Excel cannot open the fil because the file format or file extension is not valid verify the file has not been corrupted and that the file extension is valid.
I had this file open 2 seconds before formatting so i know the file is not corrupt and i am using the same verison of office as a i was before.
Please I hope someone out there is an excel expert and can help me, i know there are programs you can use but i really don't want to spend upwards of $50 on them.