Open file on network share not locking when accessed by OpenOffice Calc 3??

I am suddenly experiencing an issue in which users in a WinXP workgroup are able to simultaneously access & edit .xls spreadsheets stored on a network share. Excel used to lock one user out from editing. I realized that one of the users has been using OpenOffice Calc v3. Could this be the reason both can open & edit the sheet??
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>Could this be the reason both can open & edit the sheet?
Yes. You most probably now have a corrupted copy of the file. This is my take on 'sharing' Excel files:
Excel does not handle 'Shared' workbooks reliably. They are often corrupted at random and apparently without cause. Clearly there is a cause but it has not yet been isolated and fixed by MS. There is nothing you can do to avoid shared workbooks corrupting. The ONLY thing that can be done is to make them single user.
To help you with the single user file system try adopting this approach instead. It does work rather well so it's worth doing. First make the file(s) single user. Second edit everyone's user profile in Excel - Tools/Options/General/UserName and in there put the person's name and telephone extension number. Then whenever you attempt to open a file that someone else is using, a dialogue box will pop-up telling you who is the current user - and it tells you their telephone extension number! The new user can opt to either call the current user or open the file as read-only.
For Office 2007:  Office Button > Excel Options >Popular tab >User name
I realise it's not the message you really want, but I do hope it helps.
Additionally I don't believe it's wise to use both Excel and Open Office on the same workbook. They are not totally interchangeable applications and the small differences may cause problems.
Try the Open and Repair option - it's the dropdown at the end of the file Open button. Most people completely ignore that dropdown and some even claim it's not there! Give it a try - for repairing the file.

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bcalder123Author Commented:
Thanks patrickab. Luckily there's no file corruption. Your suggestion for tracking down the person with the file opened is excellent!
bcalder123 - Thanks for the grade - Patrick
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