There's a setting somewhere in the options which disables this. There is also a registry hotfix you can find on the internet but I AM NOT suggesting this.
Why don't you just import the files (into 150 separate ones), click on the first of the files, hold down shift and then click on the last file. All will be selected and then when you drag them onto the timeline (almost like a single file) they will be in order and in sequence!
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