QB Issue Resolution:
I don’t think the file is corrupted – that’s an issue with the 2007 program on unsupported Snow Leopard and newer OSs. The current QuickBooks Mac version is 2015 – you can buy it on Amazon direct download.
The upgrade process is you install 2015 by drag and drop and then you open your current company files. They’ll be upgraded to the new version (keeping a copy of the old version untouched). Backup the old files anyway before upgrading and save them on Dropbox, USB key, CD ROM, or somewhere safe from fire, theft, computer failure, etc.
2015 requires Mavericks or Yosemite. Keep in mind that certain older Macs won’t run these operating systems (I think these Macs are from 2007 and earlier). If you have a machine that can’t be upgraded to at least Mavericks you have to get an older copy of QuickBooks Mac. But I’d go with Yosemite and 2015 if you can.
Resolution for Issue 'I have 3 companies in which I use qb, last night I found that the files are corrupted only for one company. I’m using QB 2008 for Mac. Is there a way to restore the file?' available: Yes (Solved).
Source: Intuit Community forum.
I have 3 companies in which I use qb, last night I found that the files are corrupted only for one company. I’m using QB 2008 for Mac. Is there a way to restore the file?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.Support for Company
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