This is hardly a Win95 Setup problem and you may do better to post to
an IE newsgrpup relevant to your verions but...

What file type?

If it is only .exe files, then read on and see if this is relevant:
You may have an invalid plugin.
Netscape-Style Plug-ins Do Not Work After Upgrading Internet Explorer
[Q303401]
http://support.microsoft.com/default.aspx?scid=kb;en-us;303401

Remove the plugin with Regedit.exe
Start-Run-Regedit.exe
Navigate down to this key and remove it, after exporting it as a
normal safety precaution.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet
Explorer\Plugins\Extension\.exe

If that key exists, then you will see what plugin has been installed.
The key does not normally exist.

...Alan