Steps to Reproduce
1. Navigation to sys_properties.list.
2. Go to glide.attachment.extensions.
3. Create a list of accepted extensions (for example, jpeg, jpg, bmp, png, gif, tif, pdf, doc, docx, xls, xlsx, ppt, pptx, pdf, txt, csv, log, pst, eml).
5. Create a new incident.
6. Attach a test Microsoft Power Project (mpp) file (A file recognition error should appear).
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Related Problem: PRB598555