Hi @Pradhansb,

Thank you for a very detailed post here in the Community. I'll point you in the right direction for support with this query about a company file in QuickBooks Desktop (QBDT).

Since you did the necessary troubleshooting steps for the issue you stated above, I suggest you contact our Technical Support team for further assistance. They can pull up your company information within a secure environment, and investigate why you're unable to open a company file on the desktop computer. 

Open this article for the steps: Contact QuickBooks Desktop support. Please take note of their operating hours, so you know when they're available.

Post a reply if you have other questions about your QBDT company file, and I'll be sure to get back to you.