Explanation:

- I. An order of a High Court dismissing an appeal for the appellant’s failure to furnish order:

Such an order is considered final because it conclusively determines the rights of the parties involved, as the appeal is dismissed.

- II. An order that an appeal had abated:

This is a final order because it conclusively determines that the appeal cannot proceed further due to the lapse or inaction that led to abatement.

- III. An order in a revision reversing the dismissal of a suit and restoring it to the file of the lower court when such an order had the effect of reinstating a primary decree:

Here, it is considered final because it effectively reinstates a decision that affects the parties' rights.

- IV. An order refusing an application under s. 45 of the Specific Relief Act 1 of 1877:

This is a final order because it conclusively decides against the application, determining the party’s right under that section.

- V. An order passed by a High Court in insolvency proceedings:

Orders in insolvency proceedings can be final if they conclusively determine rights or aspects of the case.

- Option 4: All of these includes all scenarios and considers them final orders.