How do I create/update an Excel file using the API?

Hi,
I've successfully created a "Web Intelligence" document using the API (POST /raylight/v1/documents). However, I need to do the same for an Excel file type and have been unable to do so. Attached are the different steps needed to accomplish this with the UI. I need to be able to do the same thing through the API.
I searched through the docs but haven't found anything regarding this particular aspect.
Does anyone have a clue?
Thanks

Thanks for the link. I'm using .Net and thought the process would be fairly similar. It is indeed, however, I'm stuck with the following error when committing on the infoStore object:
File Repository Server error :
ErrorCode: -2147210678
Here's the code I'm using:
var folderID = infoStore.Query("Select TOP 1 SI_ID From CI_INFOOBJECTS Where SI_KIND='Folder' And SI_NAME='myfolder'")[1].ID;
var infoObjects = infoStore.NewInfoObjectCollection();
var infoObject = infoObjects.Add(CrystalDecisions.Enterprise.InfoStore.CeKind.EXCEL);
infoObject.Title = "Book4.xlsx";
infoObject.Files.Add("C:\\Users\\myuser\\Documents\\Book4.xlsx");
infoObject.ParentID = folderID;
infoStore.Commit(infoObjects);
I know the problem is related to "infoObject.Files.Add" because when I omit this statement, it works but the file has no content.
Any idea why??? It's driving me crazy

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