Skrooge support a large number of file formats, so there is every chance that you can successfully import existing data. Supported file formats are:

Format	Comments	Import	Export
.OFX / .QFX / .MT940	Widely used by banks or applications. Standard specifications make it the more robust format when available
.QIF	Widely used text format, but with no standard specification. Has some major drawbacks, like not containing the currency used, nor a defined date format. Skrooge does mostly better in processing this format than other applications, but there might still be some tricks here and there.
.CSV	Not a financial specific file formats, but sometimes used by banks or applications. Skrooge allows very flexible processing of these files
.kmy	The KMyMoney file format.
.skg	The Skrooge file format.
.sqlite	The sqlite file format.
.gnc	The GnuCash file format.
.gsb	The Grisbi file format.
.xhb	The Homebank file format.
.mmb	The Money Manager Ex file format.