Notes about the IBQ file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The IBQ file type is primarily associated with 'IsoBuster' by Smart Projects. One part of a managed image file. A managed image file (combination of an .IBP and .IBQ file) offers a way to stop extracting and resume at a later date.