---
name: "UnregisterExtensionForMIMETypeA"
section: "3w"
platform: "linux"
package: "libwine-dev"
version: "1.4.1-4"
release: "Debian 7 (Wheezy)"
platforms: ["linux"]
url: "https://new.carta.tech/UnregisterExtensionForMIMETypeA"
---

# UnregisterExtensionForMIMETypeA(3w)

## NAME

**UnregisterExtensionForMIMETypeA** (SHLWAPI.326)

## SYNOPSIS

BOOL UnregisterExtensionForMIMETypeA\
  (\
   LPCSTR *lpszType*\
  )

## DESCRIPTION

Delete a file extension from a **MIME** content type.

## PARAMS

*lpszType* **\[In\]**  Content type to delete the extension for.

## RETURNS

**Success:** **TRUE**. The file extension is deleted from the registry.

**Failure:** **FALSE**. The extension may have been removed but the key remains.

## NOTES

If deleting the extension leaves an orphan key, the key is removed also.

## IMPLEMENTATION

Exported by ordinal only. Use **[GetProcAddress(3w)](/GetProcAddress/3w.md)** to obtain a pointer to the function.

Implemented in **"dlls/shlwapi/reg.c"**.

Debug channel **"shell"**.