The Isis Property Group offered up to $100,000 on Monday for information that will force Swedish film giant Svensk Filmindustri to make good the $8.5 million in court-ordered costs it owes for breaking the lease of the Isis Theater in Aspen, Colo.

Svensk was a partner in Resort Theaters of America, which went bankrupt in 2000.

Despite the fact that Carl-John Bonnier, chairman of Svensk’s parent company, Swedish media giant the Bonnier Group, acknowledged in an email to Isis that Svensk “made a guaranty,” the matter went to litigation.

Isis won the trial and appeals — a $5.9 million judgment that has climbed to $8.5 million with costs and interest — but it has received nothing from Svensk directly, although Isis has collected about $200,000 by garnishing Svensk’s contracts with U.S. film companies, including Sony, MGM and Janus Films.

Swedish courts do not recognize U.S. judgments, and most of Svensk’s assets are held in Sweden.

Isis is offering the reward because Svensk is now attempting to avoid garnishment by changing the terms of its U.S. business arrangements.

Execs want the public to notify them if any of Svensk’s pics, which includes the catalog of the late helmer Ingmar Bergman, are shown in the U.S.

“We want everyone from studio executives to ticket-takers to know that they can collect a reward if they report to us that they are showing ‘The Virgin Spring,’ ” said Jack Smith of Isis’ law firm, Holland & Hart in Denver, referencing one of Bergman’s Academy Award-winning films.

Bonnier recently purchased 18 U.S.-based magazines from Time Warner for more than $200 million and has annual revenues of more than $3 billion.