You are not supposed to download google documents, spreadsheets, presentations, etc. You should instead export them to a suitable format.
These formats are
| Google Doc Format | Conversion Format | Corresponding MIME type |
|---|---|---|
| Documents | HTML | text/html |
| HTML (zipped) | application/zip | |
| Plain text | text/plain | |
| Rich text | application/rtf | |
| Open Office doc | application/vnd.oasis.opendocument.text | |
| application/pdf | ||
| MS Word document | application/vnd.openxmlformats-officedocument.wordprocessingml.document | |
| EPUB | application/epub+zip | |
| Spreadsheets | MS Excel | application/vnd.openxmlformats-officedocument.spreadsheetml.sheet |
| Open Office sheet | application/x-vnd.oasis.opendocument.spreadsheet | |
| application/pdf | ||
| CSV (first sheet only) | text/csv | |
| TSV (first sheet only) | text/tab-separated-values | |
| HTML (zipped) | application/zip | |
| Drawings | JPEG | image/jpeg |
| PNG | image/png | |
| SVG | image/svg+xml | |
| application/pdf | ||
| Presentations | MS PowerPoint | application/vnd.openxmlformats-officedocument.presentationml.presentation |
| Open Office presentation | application/vnd.oasis.opendocument.presentation | |
| application/pdf | ||
| Plain text | text/plain | |
| Apps Scripts | JSON | application/vnd.google-apps.script+json |
This section will eventually be enriched.