change file extension with power automate

[skarthanal]

Is it possible to change an existing file's extension in a SP document library?  I have seen many example on renaming the file's name but not the actual extension.  For example is a file's name is file.html can i change it to file.aspx without having to create a new file and deleting the old one?  Thanks!

[GeorgiosG]

Hi @skarthanal ,

I am not aware of an action for simply changing the file type with one action in Power Automate. you can Create a new file with the content and just pass in file name the new format with a concat() function. You can use directly Name with .xlsx like in my screenshot or use an expression 

concat(FileName,‘.docx‘)

[skarthanal]

Thank you your response, I was aware of this but i was looking to retain the document id and not have to create a new one and delete the old file.

[GeorgiosG]

Maybe you can use the SharePoint API with the Send HTTP Request to SharePoint action.

maybe you can go with that approach 

[skarthanal]

I tried this and got the flow to work however, it is not working as we expect.  If the file already stored in the library is <FileName.aspx> and i want to change it to <NewFile.txt> the flow will run successfully but it only changes the file's name not the extension.  I end up getting NewFile.html

[GeorgiosG]

Are you also passing in the extensions ? 

I made a quick research and also found that it Wald solved with another api endpoint, maybe that helps https://powerusers.microsoft.com/t5/General-Power-Automate/Renaming-SharePoint-file-using-REST-API-w...

[skarthanal]

Yes i am passing the filename and extension within the body liek below.  I even tried the new endpoint and it doesnt not change the actual extension.

{
"formValues":[
{
"FieldName":"FileLeafRef",
"FieldValue":"Filename.txt"
}
]
}