The Wanderer interface for WBInfo plugins is probably different than that from WB.
But I found a working solution for Wanderer and Aros 68k:
http://aminet.net/package/util/dir/icontype
Copy the instruction IconType into C: and then call it from a shell or with IconX:
Code:
IconType `requestfile`
IconType ´requestfile´
IconType 'requestfile'
Use the french accent grave (then type on space), not the single quotation mark or apostrophe.