xls and xlsx guessed as zip

[mjturtora]

I thought this might be related to the open office fix just committed so I tried v0.1.3 and same issue. Originally tried v1.0.0

I got it to work on some image and video file types but confounds xls* with zip.

Oddly, it claims the file extension is zip as well. I get:

File extension: zip File MIME type: application/zip

I haven't dug into this codebase enough to know how it tries to do it but it seems to be reading the magic numbers. There is an old Microsoft support response that may be useful but mainly because it says how hard this problem is:

Developing a tool to recognise MS Office file types ( .doc, .xls, .mdb, .ppt )