QB Issue Resolution:

Windows will allow Excel to open a .iif file if you set your Default Programs, to teach Windows that .iif “opens with Excel.” That way, you do not need to mess with setting columns, choosing delimiters, etc.

If you try to double-click .iif and have not set that default, Excel doesn’t understand this file IS something it can open.

Always save the file after editing without updating to any fancy formatting.

You can use Notepad for this, as well.

You need to edit and remove the lines I have highlighted in my attached screenshot. These Header lines tell QB this is Timer data. But QB understands regular .iif just fine, and removing those header lines bypasses the “you must use Timer” pop up error.

Keep any row that is a TIMEACT row.

You also no longer get the warning that this file has already been imported, so be cautious.

Resolution for Issue 'Pro Timer activities will not import to QuickBooks Accountant 2015' available: Yes (Solved).
Source: Intuit Community forum.

Pro Timer activities will not import to QuickBooks Accountant 2015: 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.

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