CrushFTP can use PFX keystores directly.  IIS can export to a PFX keystore and Crush can then use that keystore.\\
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Follow these steps to export your certificate chain from IIS into a keystore.  These instructions are essentially the same for IIS 6.5 to IIS 10.\\
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1.) Add the "Certificates" snap-in to your console management.\\
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For Computer Account:\\
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Local computer:\\
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2.) Now choose your certificate, personal, certificates.\\
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3.) Right click and select export under All Tasks.\\
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4.) Yes, export the private key.  This is critical or else the PFX is worthless.\\
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5.) PKCS / PFX format, and include *all* certificates in the certification path.  DO NOT select delete.\\
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6.) Enter a password for this export, only a password, not a windows account.  Remember this password as you are going to need to enter this in CrushFTP.\\
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7.) Choose where to save the PFX file.\\
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You are done.  Now you can copy this PFX file to the CrushFTP server, and browse and choose it for your SSL keystore.\\