For 99% of OnePlus users, the (available from oneplus.com) are sufficient. If you are unbricking a device, first try the MSM Download Tool recommended in OnePlus community forums by recognized developers – these often include the required drivers already.
Without access to the specific file, it's difficult to determine its exact contents. However, based on the filename, it seems likely that this RAR file contains drivers for Qualcomm hardware in OnePlus devices. oneplus-qualcomm-driver.rar
and ignore "incompatibility" warnings to force the Qualcomm signature. Where to find the drivers and guides: XDA Developers For 99% of OnePlus users, the (available from oneplus
: The most reliable source for "Mega Threads" containing these driver rar files and the accompanying "essays" on how to use them. OnePlus Community : Dedicated threads for specific models (like the OnePlus One Recovery guide However, based on the filename, it seems likely