How to get the file type in csae of .eml attachments to a mail

[pratikbomidwar]

I am using graph api to get mail attachment list.
For all other attachments I do get the name with extension like abc.txt but for mail items that is eml and msg I only get name and not extensions, for abc.eml file I get response as abc
Any idea how can I identify the file type in these cases?
Sample resp:
{
"@odata.type": "#microsoft.graph.itemAttachment",
"id": "AAMkADdkMmY3MzUzLWFiMGItNDQ5ZS1iMjgzLTE5NGRiZTgwYzExZABGAAAAAABpjTTdubhyT52Guqo1bAx7BwB9bdQ8ehiFQ4QmT22MGXlcAAAAAAEPAAB9bdQ8ehiFQ4QmT22MGXlcAAA7kSN2AAABEgAQAF3NHNAerGhAnXwNYsyzcvg=",
"lastModifiedDateTime": "2025-02-14T06:37:38Z",
"name": "PratPB",
"contentType": null,
"size": 127662,
"isInline": false
}