If you have difficulty creating or opening a portable file, check for the following:
Did you click Cancel instead of OK when creating the portable file? Before QuickBooks begins creating the portable file, it prompts you to click OK so that it can close the company file and build the portable file. If you click Cancel, QuickBooks stops trying to create the portable file so that you can continue working in the current company file.
Did you open the company file using the Open or Restore Company wizard? The wizard uncompresses the file and then rebuilds your company file—you cannot open the portable file directly or change its file extension (.qbm); the file must be uncompressed by QuickBooks using the wizard.
Go to the File menu and click Open or Restore Company.
Click Restore a portable file and then click Next.
Click the Look in drop-down list and choose the location where your portable file is stored.
Select the portable file (.qbm) and click Open.
Continue restoring normally.
Are you using a removable storage device such as a CD or USB flash drive? Try copying the portable file (.qbm) to your hard disk first, and then use the Open or Restore Company wizard to restore the portable file from the file location on your hard disk.
If the CD, USB flash drive, or other media is damaged and the file won't copy, or if you continue to experience other problems restoring the file, do not run SCAN DISK or any other disk-repair utility. The portable file is a compressed file, and while a repair utility may fix a damaged sector on the disk, it will cause further problems with the portable file, and the file still won't restore.
What does a portable company file contain?
A portable file contains only your company file financial data. Unlike a backup file, it doesn't contain related files such as letters, logos, images, and templates. It also doesn't contain a transaction log (.tlg file) which can be used to restore transaction data with the help of Intuit Technical Support, if damage or loss occurs.
When do I use a backup vs. a portable company file?
Why does it take so long to open the portable company file?
Can I merge changes back into my company file?
Visit the Portable File forum on the QuickBooks Community site. Many QuickBooks customers use the QuickBooks Community to ask and answer questions, share tips and advice, and act as peer support.
Portable company files overview
File extensions used in QuickBooks