What is correct content-type for excel files?
86974
What is a correct MIME type for .docx, .pptx, etc.?
37597
How to determine appropriate file extension from MIME Type in Java
116434
How to identify the file type of a file?
66638
Export an Excel spreadsheet to fixed-width text file?
30391
End user cannot open a .xls report exported from Salesforce
143380
Managed metadata columns in document information panel with multiple content types
158093
Use filecontents environment to write a binary file
12929
How can I determine file type without an extension on Windows?
19181
How to restrict a document library to a specific file type (extension)?
114231
What is the relationship between MIME types and File .extensions?
159002
Python - dealing with mixed-encoding files
129389
Is there a way to make my files editable for a client without InDesign?
35311
What are the available "documentclass" types and their uses?
88575
Preparing CSV files for use in ArcGIS Desktop?
142551
How to write data to an excel file?
72173
In QGIS what data file formats (etc) can be directly edited?
84395
Do I use , , or  for SVG files?