Can't open an xlsm in excel 2010 because the file format or file extension is not valid

The file is stored on an NAS that was giving me troubles. I asked people to close all files before I took it off line. Needed to flash the firmware on the NAS and it was fine again.

Not sure if any of this makes any difference, but this is all I did to lead up to this problem.

Now, when users try to open up this file, they get the above error message.

I have tried the Open and repair" option, and the open and extract data - These both failed.

I tried removing temp files on the workstations and this does not help either.

The only common element I can see is, before I shut off the NAS, the two files I am having problems with are ones that a user said he closed, but maybe it was not finished saving before I shut it off... This is a stretch, but it's the only thing I can see that is a common element to the problem.

The file in question is attached.

Thanks.


60F12-PGL-Grades-Ramp-E.xlsm
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RKoonsAsked:
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redmondbCommented:
Hi, RKoons.

Sorry, it's look to your backups time. The file consists of nothing but nulls (Hex '00').

Regards,
Brian.
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RKoonsAuthor Commented:
How were you able to see what was in of at all?
!
And what could have caused this?
0
RKoonsAuthor Commented:
How were you able to see what was in it at all?

And what could have caused this?
0
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RKoonsAuthor Commented:
How were you able to see what was in it at all?

And what could have caused this?
0
RKoonsAuthor Commented:
How were you able to see what was in it at all?

And what could have caused this?
0
RKoonsAuthor Commented:
How were you able to see what was in it at all?

And what could have caused this?
0
redmondbCommented:
RKoons,

I used a hex-editor (Fhred in my case, but there are thousands of them).

As to what caused this, I've since this happen exactly once (see final paragraph). I would suppose that the file was being saved as the NAS shutdown.

The only consolation is that it's extremely rare, so I think it unlikely that you'll ever come across it again.

Regards,
Brian.
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redmondbCommented:
...seen this happen...
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redmondbCommented:
Thanks, RKoons.
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