.xls

application/vnd.ms-excel

.xlsx

application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

.ppt

application/vnd.ms-powerpoint

.pptx

application/vnd.openxmlformats-officedocument.presentationml.presentation

And one of those you have listed is wrong:

.docx

application/vnd.openxmlformats-officedocument.wordprocessingml.document

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2x Salesforce MVP | Platform Champion | 18x Salesforce Certified | MuleSoft Certified | 8x Trailhead Ranger | TechForce Services | Sydney | Australia

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