SPAPI_E_WRONG_INF_TYPE (0x800F024A) — Fix Fast

1. Architecture Mismatch — The Classic Culprit

You downloaded a driver for 64-bit Windows, but the INF says it's for x86. Or the other way around. Windows won't install a driver built for the wrong architecture. I see this constantly with people grabbing drivers from random OEM sites that serve up the wrong architecture package.

Open the INF file with Notepad. Near the top you'll see something like:

[Manufacturer]
%ManufacturerName%=Standard, NTamd64

NTx86 means 32-bit. NTamd64 means 64-bit. NTarm64 means ARM. If your Windows is 64-bit (check in Settings > System > About) and the INF says NTx86, that's your problem. Get the right driver package.

If the INF says NTamd64 but you're on 32-bit Windows — same issue. Grab the matching architecture.

One more thing: some driver packages include INFs for multiple architectures inside a single .cab or .exe. The installer picks the right one, but if you're extracting manually and run pnputil or Add-PrinterDriver, you can point to the wrong INF. Be precise with the path.

2. Catalog File Missing or Invalid

Windows checks the digital signature of the driver catalog file (.cat) against the INF. If the .cat file is missing, corrupted, or doesn't match the INF hash, you'll get 0x800F024A.

First, check if the .cat file exists in the same folder as the INF. If it's missing, re-extract the driver package. Don't delete the .cat file.

Next, verify the signature. Right-click the .cat file, go to Digital Signatures tab, and make sure it shows a valid certificate chain. If it says "The digital signature is invalid" or "This file is not digitally signed", the driver is either tampered with or not signed for your Windows version.

For Windows 10/11 64-bit, drivers must be SHA-256 signed. Old SHA-1 signed drivers (common from 2015 and earlier) will fail unless you're on a very old build. You can sometimes force install with bcdedit /set testsigning on, but that's a temporary dev workaround — don't run that on a production machine.

If you're comfortable with the command line, use signtool verify /pa to check the .cat file:

signtool verify /pa driver.cat

Output should say Signatures verified. Anything else means the catalog is busted.

3. INF Targets Wrong Device Class or Setup Class

This one's rarer but I've seen it. The INF has a [ClassInstall32] section that says the driver is for a Bluetooth device, but you're trying to install it on a network adapter. Windows checks that the INF's device class matches the device you're targeting.

Open the INF, look for:

[Version]
Class=Net
ClassGuid={4d36e972-e325-11ce-bfc1-08002be10318}

If the ClassGuid doesn't match the actual device type, you get this error. Common mismatches: trying to install a USB driver as a printer driver, or a display driver as a system device.

To check what class the device expects, open Device Manager, find the device (it'll have a yellow exclamation), right-click > Properties > Details tab > Property dropdown > Class Guid. Compare that GUID with the one in the INF's [Version] section. If they don't match, you've got the wrong driver for that device.

Solution: get the correct driver for that device class. Don't try to hack the INF — you'll break the signature check and still fail.

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