Returns the status of an extension, by filename.
int GetExtensionFileStatus(const char name, char error, int maxlength)
Extension name (like "sdktools.ext").
Optional error message buffer.
Length of optional error message buffer.
-2 if the extension was not found. -1 if the extension was found but failed to load. 0 if the extension loaded but reported an error. 1 if the extension is running without error.