I'm running into an issue where I cannot change the content type of any xml-based Office documents. Here's what I've done:
1 - Create a custom content (A) type based off the Document content type
2 - Enable the custom content type in a document library
3 - Add a document or select an existing document and edit the content type to the custom content type
4 - The custom content type will save for documents such as .ppt, .doc, etc. The custom content type will now save for .docx, .pptx or .xlsx files. The properties window will save without displaying any errors but the content type will not change
I ran several tests including creating another custom content type (B) based off of the Document content type. I proved that:
- The custom content type (B) can be saved to .docx, .pptx or .xlsx files IF no additional columns are added to the custom content type
- As soon as I add a column to the custom content type the aforementioned documents cannot be saved as that custom content type
Documents created through the File option in a document library also fail to change content type to the custom content type when saved. Most of my files are .docx, .pptx, or .xlsx files, and this issue poses a significant roadblock in our SharePoint roll-out. I appreciate any advise you can provide.